--- a/modules/libmar/tool/mar.c
+++ b/modules/libmar/tool/mar.c
@@ -169,17 +169,18 @@ int main(int argc, char **argv) {
     print_usage();
     return -1;
   }
 
   switch (argv[1][1]) {
   case 'c': {
     struct ProductInformationBlock infoBlock;
     infoBlock.MARChannelID = MARChannelID;
-    infoBlock.productVersion = productVersion;
+    // Temporarily hardcoded - see Bug 735784
+    infoBlock.productVersion = "13.0a1";//productVersion;
     return mar_create(argv[2], argc - 3, argv + 3, &infoBlock);
   }
   case 'i': {
     struct ProductInformationBlock infoBlock;
     infoBlock.MARChannelID = MARChannelID;
     infoBlock.productVersion = productVersion;
     return refresh_product_info_block(argv[2], &infoBlock);
   }

--- a/toolkit/mozapps/update/updater/archivereader.cpp
+++ b/toolkit/mozapps/update/updater/archivereader.cpp
@@ -214,32 +214,35 @@ ArchiveReader::VerifyProductInformation(
       if (!strcmp(channel, productInfoBlock.MARChannelID)) {
         rv = OK;
         break;
       }
       channel = strtok(NULL, delimiter);
     }
   }
 
+// Temporarily disabled - see Bug 735784
+#if 0
   if (rv == OK) {
     /* Compare both versions to ensure we don't have a downgrade
         -1 if appVersion is older than productInfoBlock.productVersion
         1 if appVersion is newer than productInfoBlock.productVersion
         0 if appVersion is the same as productInfoBlock.productVersion
        This even works with strings like:
         - 12.0a1 being older than 12.0a2
         - 12.0a2 being older than 12.0b1
         - 12.0a1 being older than 12.0
         - 12.0 being older than 12.1a1 */
     int versionCompareResult = 
       NS_CompareVersions(appVersion, productInfoBlock.productVersion);
     if (1 == versionCompareResult) {
       rv = VERSION_DOWNGRADE_ERROR;
     }
   }
+#endif
 
   free((void *)productInfoBlock.MARChannelID);
   free((void *)productInfoBlock.productVersion);
   return rv;
 }
 
 int
 ArchiveReader::Open(const NS_tchar *path)