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Re: S3 4.1.2 Update problem
I had that happen beause I had rooted my phone, but left the boot locked. The first thing I tried was using voodoo rootkeeper to save my root, and then tried to take the OTA update...after downloading the update, it booted into TWRP recovery that I had installed, and I didn't know what to do from there at the time. Since then, I've heard that you should use the TWRP recovery to install the downloaded update image, but didn't know that at the time, so I just rebooted from there and got "update failed" (gee, I wonder why *smile*). The next thing I tried was writing the 4.1.2 image and modem update to my phone, and installing them via TWRP. This was good until I tried to reboot *smile*, at which time I got the dreaded yellow Verizon triangle. At that point, I realized that happened since I hadn't unlocked the boot on my phone, just rooted it. I could have (most likely) installed the 4.1.2 unlocked boot at that point and things would have been fine, but I didn't do that.
Originally Posted by Jason Gregory
So...I happen to have the stock 4.1.1 full factory image lying around *smile*, all 1.2GB of it. I wrote that to my phone using Odin. which restored my phone to pure stock. Then I could take the OTA update to 4.1.2, which worked fine. Rooted that, and remembered to unlock my boot this time as well as rooting, and things are good again.
Just one note...I couldn't turn my phone off with the yellow triangle on it, so to get to Odin, I just did the usual "boot to Odin mode" with the yellow triangle showing, and that worked. So, to get to Odin download mode, you don't have to turn your phone off if the yellow triangle is showing. It occurred to me afterwards, that I could probably have pulled my battery, and put it back in, and that would have turned my phone off, but I didn't think of that at the time.
So, I took the long road, but back with a 4.1.2 phone, rooted with unlocked boot. The other advantage of unlocked boot is that I don't see the "Custom" with the unlocked padlock symbol every time I boot, it looks like a normal boot.
Now I'm looking for the full 4.1.2 stock image, in case I need to quickly bring my phone back to 4.1.2 factory stock...haven't found that yet, it may not be avvailable quite yet.