diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index a1ba28e..f7a26bc 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -59,5 +59,5 @@ jobs:
         with:
           repo_token: ${{ secrets.GITHUB_TOKEN }}
           tag: ${{ steps.version.outputs.version}}
-          file: ./.pio/build/*/*-all.bin
+          file: ./.pio/build/*/*-{all,update}.bin
           file_glob: true
diff --git a/post.py b/post.py
index 6fae19a..c85a740 100644
--- a/post.py
+++ b/post.py
@@ -1,7 +1,35 @@
 Import("env", "projenv")
 import os
+import glob
+import shutil
 
 print("##post script running")
+HDROFFSET=288
+VERSIONOFFSET=16
+NAMEOFFSET=48
+MINSIZE=HDROFFSET+NAMEOFFSET+32
+CHECKBYTES={
+    0: 0xe9, #image magic
+    288: 0x32, #app header magic
+    289: 0x54,
+    290: 0xcd,
+    291: 0xab
+}
+def getString(buffer,offset,len):
+    return buffer[offset:offset+len].rstrip(b'\0').decode('utf-8')
+
+def getFirmwareInfo(imageFile):
+    with open(imageFile,"rb") as ih:
+        buffer=ih.read(MINSIZE)
+        if len(buffer) != MINSIZE:
+            raise Exception("invalid image file %s, to short",imageFile)
+        for k,v in CHECKBYTES.items():
+            if buffer[k] != v:
+                raise Exception("invalid magic in %s at %d, expected %d got %d"
+                    %(imageFile,k,v,buffer[k]))
+        name=getString(buffer,HDROFFSET+NAMEOFFSET,32)      
+        version=getString(buffer,HDROFFSET+VERSIONOFFSET,32)
+    return (name,version)    
 
 def post(source,target,env):
     #print(env.Dump())
@@ -10,6 +38,8 @@ def post(source,target,env):
     base=env.subst("$PIOENV")
     appoffset=env.subst("$ESP32_APP_OFFSET")
     firmware=env.subst("$BUILD_DIR/${PROGNAME}.bin")
+    (fwname,version)=getFirmwareInfo(firmware)
+    print("found fwname=%s, fwversion=%s"%(fwname,version))
     python=env.subst("$PYTHONEXE")
     print("base=%s,esptool=%s,appoffset=%s,uploaderflags=%s"%(base,esptool,appoffset,uploaderflags))
     uploadparts=uploaderflags.split(" ")
@@ -23,7 +53,17 @@ def post(source,target,env):
             print("file %s for combine not found"%uploadfiles[i])
             return
     offset=uploadfiles[0]
-    outfile=os.path.join(env.subst("$BUILD_DIR"),base+"-all.bin")
+    #cleanup old versioned files
+    outdir=env.subst("$BUILD_DIR")
+    for f in glob.glob(os.path.join(outdir,base+"*.bin")):
+        print("removing old file %s"%f)
+        os.unlink(f)
+    ofversion=''
+    if not version.startswith('dev'):
+        ofversion="-"+version
+        versionedFile=os.path.join(outdir,"%s%s-update.bin"%(base,ofversion))
+        shutil.copyfile(firmware,versionedFile)
+    outfile=os.path.join(outdir,"%s%s-all.bin"%(base,ofversion))
     cmd=[python,esptool,"--chip","esp32","merge_bin","--target-offset",offset,"-o",outfile]
     cmd+=uploadfiles
     cmd+=[appoffset,firmware]        
diff --git a/src/main.cpp b/src/main.cpp
index ff74de7..318c04b 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -16,7 +16,7 @@
 #ifdef GWRELEASEVERSION
 #define VERSION GWSTRINGIFY(GWRELEASEVERSION)
 #define LOGLEVEL GwLog::ERROR
-#endif
+#else
 #ifdef GWDEVVERSION
 #define VERSION GWSTRINGIFY(GWDEVVERSION)
 #define LOGLEVEL GwLog::DEBUG
@@ -25,6 +25,7 @@
 #define VERSION "0.7.0"
 #define LOGLEVEL GwLog::DEBUG
 #endif
+#endif
 
 // #define GW_MESSAGE_DEBUG_ENABLED
 //#define FALLBACK_SERIAL