diff --git a/admin/api/exercice.go b/admin/api/exercice.go
index cfdb450d..13df73e7 100644
--- a/admin/api/exercice.go
+++ b/admin/api/exercice.go
@@ -62,6 +62,7 @@ func declareExercicesRoutes(router *gin.RouterGroup) {
 	apiFlagsRoutes.POST("/try", tryExerciceFlag)
 	apiFlagsRoutes.DELETE("/", deleteExerciceFlag)
 	apiFlagsRoutes.GET("/dependancies", showExerciceFlagDeps)
+	apiFlagsRoutes.GET("/statistics", showExerciceFlagStats)
 	apiFlagsRoutes.GET("/choices/", listFlagChoices)
 	apiFlagsChoicesRoutes := apiExercicesRoutes.Group("/choices/:cid")
 	apiFlagsChoicesRoutes.Use(FlagChoiceHandler)
@@ -852,6 +853,34 @@ func showExerciceFlagDeps(c *gin.Context) {
 	c.JSON(http.StatusOK, deps)
 }
 
+func showExerciceFlagStats(c *gin.Context) {
+	exercice := c.MustGet("exercice").(*fic.Exercice)
+	flag := c.MustGet("flag-key").(*fic.FlagKey)
+
+	history, err := exercice.GetHistory()
+	if err != nil {
+		log.Println("Unable to getExerciceHistory:", err.Error())
+		c.AbortWithStatusJSON(http.StatusInternalServerError, gin.H{"errmsg": "An error occurs when retrieving exercice history"})
+		return
+	}
+
+	var completed, tries, nteams int64
+
+	for _, hline := range history {
+		if hline["kind"].(string) == "flag_found" {
+			if *hline["secondary"].(*int) == flag.Id {
+				completed += 1
+			}
+		}
+	}
+
+	c.JSON(http.StatusOK, gin.H{
+		"completed": completed,
+		"tries":     tries,
+		"nteams":    nteams,
+	})
+}
+
 func tryExerciceFlag(c *gin.Context) {
 	flag := c.MustGet("flag-key").(*fic.FlagKey)
 
@@ -1048,7 +1077,11 @@ func updateExerciceQuiz(c *gin.Context) {
 			if cur.Id == next.Id {
 				seen = true
 
+				log.Println("ici", cur.Label, cur.Response, next.Response)
+
 				if cur.Label != next.Label || cur.Response != next.Response {
+					log.Println("1", cur.Label, cur.Response, next.Response)
+
 					cur.Label = next.Label
 					cur.Response = next.Response
 					if _, err := cur.Update(); err != nil {
diff --git a/admin/static/js/app.js b/admin/static/js/app.js
index 0753bbb0..2fa150f4 100644
--- a/admin/static/js/app.js
+++ b/admin/static/js/app.js
@@ -348,6 +348,9 @@ angular.module("FICApp")
 	.factory("ExerciceFlagDeps", function ($resource) {
 		return $resource("api/exercices/:exerciceId/flags/:flagId/dependancies", { exerciceId: '@idExercice', flagId: '@id' })
 	})
+	.factory("ExerciceFlagStats", function ($resource) {
+		return $resource("api/exercices/:exerciceId/flags/:flagId/statistics", { exerciceId: '@idExercice', flagId: '@id' })
+	})
 	.factory("ExerciceMCQFlag", function ($resource) {
 		return $resource("api/exercices/:exerciceId/quiz/:mcqId", { exerciceId: '@idExercice', mcqId: '@id' }, {
 			update: { method: 'PUT' }
@@ -2345,6 +2348,12 @@ angular.module("FICApp")
 		}
 	})
 
+	.controller("ExerciceFlagStatsController", function ($scope, $routeParams, ExerciceFlagStats) {
+		$scope.init = function (flag) {
+			$scope.stats = ExerciceFlagStats.get({ exerciceId: $routeParams.exerciceId, flagId: flag.id });
+		}
+	})
+
 	.controller("ExerciceMCQFlagsController", function ($scope, ExerciceMCQFlag, $routeParams, $rootScope) {
 		$scope.quiz = ExerciceMCQFlag.query({ exerciceId: $routeParams.exerciceId });
 
diff --git a/admin/static/views/exercice-flags.html b/admin/static/views/exercice-flags.html
index 3caf3add..b23556ca 100644
--- a/admin/static/views/exercice-flags.html
+++ b/admin/static/views/exercice-flags.html
@@ -73,12 +73,21 @@
 	</div>
 	<div class="col-4">
 	  <div ng-controller="ExerciceFlagDepsController" ng-init="init(flag)">
-	    Dépendances&nbsp;:
+	    <strong>Dépendances&nbsp;:</strong>
 	    <ul ng-if="deps.length > 0">
 	      <dependancy ng-repeat="dep in deps" dep="dep"></dependancy>
 	    </ul>
 	    <span ng-if="deps.length == 0"> sans</span>
 	  </div>
+          <hr>
+	  <div ng-controller="ExerciceFlagStatsController" ng-init="init(flag)">
+            <strong>Statistiques</strong>
+	    <ul>
+	      <li>Validés : {{ stats["completed"] }}</li>
+	      <li>Tentés : {{ stats["tries"] }}</li>
+	      <li>Équipes : {{ stats["nteams"] }}</li>
+	    </ul>
+	  </div>
 	</div>
 	<div class="col-4" ng-controller="ExerciceFlagChoicesController">
 	  <div class="btn-toolbar justify-content-end mb-2" role="toolbar">
diff --git a/admin/static/views/file-list.html b/admin/static/views/file-list.html
index cd0d36a7..83a3242c 100644
--- a/admin/static/views/file-list.html
+++ b/admin/static/views/file-list.html
@@ -30,13 +30,13 @@
           <div class="spinner-border spinner-border-sm" role="status" ng-if="file.gunzipWIP"></div>
         </button>
       </td>
-      <td ng-repeat="field in fields">
+      <td ng-repeat="field in fields" class="text-truncate" style="max-width: 30vw" title="{{ file[field] }}">
 	{{ file[field] }}
 	<span ng-if="field == 'id' && file.err !== undefined && file.err !== true" title="{{ file.err }}" class="glyphicon glyphicon-exclamation-sign"></span>
       </td>
-      <td>
-	{{ file.checksum | bto16 }}
-	<div ng-if="file.checksum_shown">{{ file.checksum_shown | bto16 }}</div>
+      <td style="max-width: 100px">
+	<div class="text-truncate" title="{{ file.checksum | bto16 }}">{{ file.checksum | bto16 }}</div>
+	<div class="text-truncate" ng-if="file.checksum_shown" title="{{ file.checksum_shown | bto16 }}">{{ file.checksum_shown | bto16 }}</div>
       </td>
     </tr>
   </tbody>
diff --git a/admin/sync/exercice_keys.go b/admin/sync/exercice_keys.go
index 8404df86..d4a88f3c 100644
--- a/admin/sync/exercice_keys.go
+++ b/admin/sync/exercice_keys.go
@@ -279,6 +279,7 @@ func buildKeyFlag(exercice *fic.Exercice, flag ExerciceFlag, flagline int, defau
 }
 
 type importFlag struct {
+	origin    ExerciceFlag
 	Line      int
 	Flag      fic.Flag
 	JustifyOf *fic.MCQ_entry
@@ -392,8 +393,9 @@ func buildExerciceFlag(i Importer, exercice *fic.Exercice, flag ExerciceFlag, nl
 		errs = multierr.Append(errs, berrs)
 		if addedFlag != nil {
 			ret = append(ret, importFlag{
-				Line: nline + 1,
-				Flag: addedFlag,
+				origin: flag,
+				Line:   nline + 1,
+				Flag:   addedFlag,
 			})
 		}
 	} else if flag.Type == "key" || strings.HasPrefix(flag.Type, "number") || flag.Type == "text" || flag.Type == "ucq" || flag.Type == "radio" || flag.Type == "vector" {
@@ -401,6 +403,7 @@ func buildExerciceFlag(i Importer, exercice *fic.Exercice, flag ExerciceFlag, nl
 		errs = multierr.Append(errs, berrs)
 		if addedFlag != nil {
 			ret = append(ret, importFlag{
+				origin:  flag,
 				Line:    nline + 1,
 				Flag:    *addedFlag,
 				Choices: choices,
@@ -462,6 +465,7 @@ func buildExerciceFlag(i Importer, exercice *fic.Exercice, flag ExerciceFlag, nl
 				errs = multierr.Append(errs, berrs)
 				if addedFlag != nil {
 					ret = append(ret, importFlag{
+						origin:    flag,
 						Line:      nline + 1,
 						Flag:      *addedFlag,
 						JustifyOf: entry,
@@ -479,8 +483,9 @@ func buildExerciceFlag(i Importer, exercice *fic.Exercice, flag ExerciceFlag, nl
 		}
 
 		ret = append([]importFlag{importFlag{
-			Line: nline + 1,
-			Flag: &addedFlag,
+			origin: flag,
+			Line:   nline + 1,
+			Flag:   &addedFlag,
 		}}, ret...)
 	}
 	return
@@ -570,6 +575,10 @@ func CheckExerciceFlags(i Importer, exercice *fic.Exercice, files []string, exce
 				if int64(fk.ChoicesCost) >= exercice.Gain {
 					errs = multierr.Append(errs, NewFlagError(exercice, nil, flag.Line, fmt.Errorf("flag's choice_cost is higher than exercice gain")))
 				}
+
+				if raw, ok := flag.origin.Raw.(string); ok && raw == fk.Placeholder {
+					errs = multierr.Append(errs, NewFlagError(exercice, nil, flag.Line, fmt.Errorf("flag's placeholder and raw are identical")))
+				}
 			}
 
 			// Check dependency loop
diff --git a/configs/gen_metadata.sh b/configs/gen_metadata.sh
index ccb2f4fe..f51984eb 100755
--- a/configs/gen_metadata.sh
+++ b/configs/gen_metadata.sh
@@ -20,6 +20,8 @@ escape_newline () {
     sed 's/$/\\n/g' | tr -d '\n'
 }
 
+which mkisofs > /dev/null 2> /dev/null || { echo "Please install genisoimage (Debian/Ubuntu) or cdrkit (Alpine)" >&2; exit 1; }
+
 if [ $# -gt 0 ]
 then
     which jq > /dev/null 2> /dev/null || { echo "Please install jq" >&2; exit 1; }
diff --git a/configs/update_imgs.sh b/configs/update_imgs.sh
index 13866c22..fa507cee 100644
--- a/configs/update_imgs.sh
+++ b/configs/update_imgs.sh
@@ -21,6 +21,8 @@ OLD_KEY=$(cat /run/config/dm-crypt/key)
 [ "${NEW_KEY}" != "${OLD_KEY}" ] && {
     read -p "DM-CRYPT key changed in metadata, are you sure you want to erase it? (y/N) " V
     [ "$V" != "y" ] && [ "$V" != "Y" ] && while true; do
+        mv /boot/imgs/fickit-metadata.iso /boot/imgs/fickit-metadata.iso.skipped
+        cp /boot/imgs/fickit-metadata.iso.bak /boot/imgs/fickit-metadata.iso
         echo
         echo "Metadata drive not erased"
         echo
diff --git a/fickit-backend.yml b/fickit-backend.yml
index be0ecef7..16a57215 100644
--- a/fickit-backend.yml
+++ b/fickit-backend.yml
@@ -153,6 +153,15 @@ onboot:
       mkdir:
         - /var/lib/fic/secrets
 
+  - name: create-ssh-keys
+    image: nemunaire/rsync:a3d76b2dd0a9ad73be44dc77ad765b20d96a3285
+    command: ["/bin/sh", "-c", "touch /etc/ssh/sshd_config && ssh-keygen -A"]
+    binds:
+      - /var/lib/fic/ssh:/etc/ssh
+    runtime:
+      mkdir:
+        - /var/lib/fic/ssh
+
 services:
 #  - name: getty
 #    image: linuxkit/getty:bae9e3d4861173bacf78f14a4fe44997a430d13b
@@ -361,7 +370,6 @@ services:
         - /var/lib/fic/files
         - /var/lib/fic/pki/shared
         - /var/lib/fic/settingsdist
-        - /var/lib/fic/ssh
         - /var/lib/fic/submissions
         - /var/lib/fic/teams
         - /var/log/frontend
diff --git a/fickit-frontend.yml b/fickit-frontend.yml
index d2c558a2..c50b9141 100644
--- a/fickit-frontend.yml
+++ b/fickit-frontend.yml
@@ -136,6 +136,15 @@ onboot:
       - /etc/iptables/rules.v6:/etc/iptables/rules.v6:ro
     net: /run/netns/sshd
 
+  - name: create-ssh-keys
+    image: nemunaire/rsync:a3d76b2dd0a9ad73be44dc77ad765b20d96a3285
+    command: ["/bin/sh", "-c", "touch /etc/ssh/sshd_config && ssh-keygen -A"]
+    binds:
+      - /var/lib/fic/ssh:/etc/ssh
+    runtime:
+      mkdir:
+        - /var/lib/fic/ssh
+
 services:
 #  - name: getty
 #    image: linuxkit/getty:bae9e3d4861173bacf78f14a4fe44997a430d13b
@@ -257,7 +266,6 @@ services:
         - /var/lib/fic/files
         - /var/lib/fic/pki
         - /var/lib/fic/settingsdist
-        - /var/lib/fic/ssh
         - /var/lib/fic/submissions
         - /var/lib/fic/teams
 
diff --git a/fickit-prepare.yml b/fickit-prepare.yml
index 64f7b3ba..b8472acb 100644
--- a/fickit-prepare.yml
+++ b/fickit-prepare.yml
@@ -7,9 +7,9 @@ kernel:
 init:
   - nemunaire/mdadm:04814350d71ba9417e1f861be1685de26adf7a67
   - nemunaire/syslinux:086f221f281d577d300949aa1094fb20c5cd90dc
-  - linuxkit/format:3c858f0cf42a2b14441bfb5c266b78f14d2b75a4
-  - linuxkit/dm-crypt:19fa6affe9da03afc91694e36d72a4924c65a0e0
-  - linuxkit/metadata:f35b5aafc7d19bb6a44a900840727902dad78e44
+  - linuxkit/format:8f487d728959192289e0783784fc2b185eadbc82
+  - linuxkit/dm-crypt:ad2a05dcffa28ef809a61aa27ba230c82f02f603
+  - linuxkit/metadata:83cda7b43112b201613084ea8b7fab585b6e5549
   - alpine:latest
 
 files:
diff --git a/frontend/fic/src/lib/components/ExerciceDownloads.svelte b/frontend/fic/src/lib/components/ExerciceDownloads.svelte
index c05a45a0..14ae7e7e 100644
--- a/frontend/fic/src/lib/components/ExerciceDownloads.svelte
+++ b/frontend/fic/src/lib/components/ExerciceDownloads.svelte
@@ -33,9 +33,9 @@
                     </h1>
                     <div style="min-width: 0">
 		        <h4 class="fw-bold"><samp>{file.name}</samp></h4>
-                        {#if file.disclamer}
-                            <div class="file-disclamer text-warning">
-		                {file.disclamer}
+                        {#if file.disclaimer}
+                            <div class="file-disclaimer text-warning">
+		                {file.disclaimer}
                             </div>
                         {/if}
                         <nobr>
@@ -61,10 +61,10 @@
 {/if}
 
 <style>
- .file-disclamer {
+ .file-disclaimer {
      display: none;
  }
- :global(.list-group-item:hover .file-disclamer) {
+ :global(.list-group-item:hover .file-disclaimer) {
      display: block;
  }
 </style>
diff --git a/libfic/file.go b/libfic/file.go
index 4e5bf37f..d39bb6b0 100644
--- a/libfic/file.go
+++ b/libfic/file.go
@@ -392,7 +392,12 @@ func (f *EFile) GetDepends() ([]Flag, error) {
 
 // CheckFileOnDisk recalculates the hash of the file on disk.
 func (f *EFile) CheckFileOnDisk() error {
-	if _, size, err := checkFileHash(path.Join(FilesDir, f.Path), f.Checksum); err != nil {
+	firstChecksum := f.Checksum
+	if len(f.ChecksumShown) > 0 {
+		firstChecksum = f.ChecksumShown
+	}
+
+	if _, size, err := checkFileHash(path.Join(FilesDir, f.Path), firstChecksum); size > 0 && err != nil {
 		return err
 	} else if size == 0 {
 		if _, _, err := checkFileHash(path.Join(FilesDir, f.Path+".gz"), f.Checksum); err != nil {
@@ -400,9 +405,17 @@ func (f *EFile) CheckFileOnDisk() error {
 		} else {
 			return nil
 		}
-	} else {
-		return nil
+	} else if err != nil {
+		return err
 	}
+
+	if _, err := os.Stat(path.Join(FilesDir, f.Path+".gz")); !os.IsNotExist(err) {
+		if _, _, err = checkFileHash(path.Join(FilesDir, f.Path+".gz"), f.Checksum); err != nil {
+			return err
+		}
+	}
+
+	return nil
 }
 
 // GunzipFileOnDisk gunzip a compressed file.
diff --git a/libfic/mcq.go b/libfic/mcq.go
index 82315479..04bf3fd9 100644
--- a/libfic/mcq.go
+++ b/libfic/mcq.go
@@ -207,7 +207,7 @@ func (m *MCQ) AddEntry(e *MCQ_entry) (*MCQ_entry, error) {
 
 // Update applies modifications back to the database.
 func (n *MCQ_entry) Update() (int64, error) {
-	if res, err := DBExec("UPDATE mcq_entries SET label = ?, response = ? WHERE id_mcq = ?", n.Label, n.Response, n.Id); err != nil {
+	if res, err := DBExec("UPDATE mcq_entries SET label = ?, response = ? WHERE id_mcq_entry = ?", n.Label, n.Response, n.Id); err != nil {
 		return 0, err
 	} else if nb, err := res.RowsAffected(); err != nil {
 		return 0, err