diff --git a/Numworks.js b/Numworks.js
index 77df5a1..260850e 100644
--- a/Numworks.js
+++ b/Numworks.js
@@ -376,7 +376,7 @@ class Numworks {
         }
         if (!magikFound) {
             data["magik"] = false;
-            console.warn("No usermand magic")
+            console.warn("No userland magic")
             return data
         }
 
@@ -516,7 +516,7 @@ class Numworks {
 
         const magik = 0xBADBEEEF;
         // Hack to handle corrupted slotInfo magik on old Upsilon Bootloader versions (pre 1.0.13)
-        data["slot"]["magik"] = (dv.getUint32(0x00, false) == magik) || (data["slot"]["magik"] = dv.getUint24(0x01, false) == 0xDBEEEF08);
+        data["slot"]["magik"] = (dv.getUint32(0x00, false) == magik) || ((dv.getUint32(0x00, false) & 0x00FFFFFF) == (magik & 0x00FFFFFF));
         // Check if the data is valid
         if (data["slot"]["magik"]) {
             // Check if the end magic is present
@@ -674,12 +674,23 @@ class Numworks {
      *
      * @param   address     Storage address
      * @param   size        Storage size.
+     * @param   version     Calculator version
      *
      * @return  The storage, as a Blob.
      */
-    async __retrieveStorage(address, size) {
+    async __retrieveStorage(address, size, version) {
+        if (version >= "24.2.0") {
+            await this.device.device_.selectAlternateInterface(this.device.intfNumber, 1);
+        }
+
         this.device.startAddress = address;
-        return await this.device.do_upload(this.transferSize, size + 8);
+        let data = await this.device.do_upload(this.transferSize, size + 8);
+
+        if (version >= "24.2.0") {
+            await this.device.device_.selectAlternateInterface(this.device.intfNumber, 0);
+        }
+
+        return data
     }
 
     /**
@@ -687,10 +698,19 @@ class Numworks {
      *
      * @param   address     Storage address
      * @param   data        Storage data.
+     * @param   version     Calculator version
      */
-    async __flashStorage(address, data) {
+    async __flashStorage(address, data, version) {
+        if (version >= "24.2.0") {
+            await this.device.device_.selectAlternateInterface(this.device.intfNumber, 1);
+        }
+
         this.device.startAddress = address;
         await this.device.do_download(this.transferSize, data, false);
+
+        if (version >= "24.2.0") {
+            await this.device.device_.selectAlternateInterface(this.device.intfNumber, 0);
+        }
     }
 
     /**
@@ -705,7 +725,7 @@ class Numworks {
         let pinfo = await this.getPlatformInfo();
 
         let storage_blob = await storage.encodeStorage(pinfo["storage"]["size"]);
-        await this.__flashStorage(pinfo["storage"]["address"], await storage_blob.arrayBuffer());
+        await this.__flashStorage(pinfo["storage"]["address"], await storage_blob.arrayBuffer(), pinfo["version"]);
 
         callback();
     }
@@ -718,7 +738,7 @@ class Numworks {
     async backupStorage() {
         let pinfo = await this.getPlatformInfo();
 
-        let storage_blob = await this.__retrieveStorage(pinfo["storage"]["address"], pinfo["storage"]["size"]);
+        let storage_blob = await this.__retrieveStorage(pinfo["storage"]["address"], pinfo["storage"]["size"], pinfo["version"]);
 
         let storage = new Numworks.Storage();
 
diff --git a/Storage.js b/Storage.js
index 9712f78..b22423f 100644
--- a/Storage.js
+++ b/Storage.js
@@ -14,7 +14,7 @@ class Storage {
     }
 
     async __encodePyRecord(record) {
-        var content = new TextEncoder("utf-8").encode(record.code);
+        var content = new TextEncoder("utf-8").encode(record.code.normalize('NFKD'));
 
         record.data = new Blob([
             concatTypedArrays(
@@ -48,7 +48,9 @@ class Storage {
             var name = record.name + "." + record.type;
 
             var encoded_name = concatTypedArrays(
-                encoder.encode(name),
+                // We remove non-ASCII characters as they often cause calculator crashs
+                // Upsilon.js don't support reading non-ASCII filenames
+                encoder.encode(name.replace(/[^\x00-\x7F]/g, "")),
                 new Uint8Array([0])
             );
 
@@ -165,7 +167,9 @@ class Storage {
         var dv = new DataView(await record.data.arrayBuffer());
 
         record.autoImport = dv.getUint8(0) !== 0;
-        record.code = this.__readString(dv, 1, record.data.size - 1).content;
+
+        var codeDataview = new DataView(await record.data.slice(1, record.data.size - 1).arrayBuffer());
+        record.code = new TextDecoder("utf-8").decode(codeDataview);
 
         delete record.data;
 
diff --git a/package.json b/package.json
index b6b81a6..c7fd356 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "upsilon.js",
-    "version": "1.4.2",
+    "version": "1.5.0",
     "description": "Utility classes to interact with a Numworks calculator using WebUSB.",
     "main": "index.js",
     "scripts": {