I updated to Cyanogenmod 10.1 RC 2 and can't update beyond it. When I try to update to RC5, I get:

assert failed: getprop("ro.bootloader") not matching
"I747UCDLK3" or "I747MVLDLK4" or "I747MUMBLK3" or "I747MUMBLL1"

Which naturally causes the update to be cancelled

Does anyone have a link that shows how to resolve this, or other suggestions to resolve it? Thanks.

2 Answers 2


The message is basically telling you that you don't have the correct bootloader version on your device; specifically, you most likely have an older ICS bootloader rather than the Jelly Bean one. You can read a bit about this on CyanogenMod's Google+ page, and the CM Wiki page for the S3 succinctly notes:

Going forward, CM10.1 is no longer compatible with ICS bootloaders on this device. Please update or else you will get assert failures in recovery.

You'll need to upgrade to a newer bootloader. This carries some amount of risk since it's one of the few instances where you could potentially brick a device, but the risk is still generally pretty small.

I found links to the newer AT&T bootloader on XDA that will work with CM 10.1. You can flash them using Odin or Heimdall by following these instructions:

  1. Go here http://forum.xda-developers.com/showpost.php?p=41503727&postcount=13716

  2. Put phone into download mode and then open Odin.

  3. Choose the PDA slot and then select the correct file for your device (AT&T is LK3)

  4. Hit start and wait until its finished.

  5. Done

  • Thanks for answering so clearly, when obviously it's something I should have been able to find on my own. Don't know why I couldn't find it. I was able to update to RC5 successfully. Jun 7, 2013 at 22:58
  • Odin3 v3.07 works with SGH-I747, even though it is not listed on the page.
    – Nican
    Jul 12, 2013 at 21:11

I ended up following the instructions here and was then able to update to 10.1.3RC2. No need to install Odin or Heimdall on your computer :)

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