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[Q] Any possible way to downgrade from OTA 4.3 for unlock? Experienced w/ root

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wardlogan
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Default [Q] Any possible way to downgrade from OTA 4.3 for unlock? Experienced w/ root

Hello,
I know this is a common issue, I haven't found any clear information anywhere I've looked though. I've got a M919 S4 that was OTA upgraded to 4.3 with MK2 baseband. Still stock, still unrooted. I ordered an unlock code from unlockcodesource, they give three codes to attempt, all of which failed. In the past, we would simply downgrade from 4.1.2 to 4.1.1 with Odin and navigate to the UMTS menu and unlock from there. Now after the 4.3 upgrade with knox, all codes are failing and I obviously can't use the UMTS menu trick because it only works on 4.1.1.

Does anyone know of some not so simple methods to downgrade without bricking? Can I root, flash a custom earlier version image and earlier bootloader, and flash the stock 4.1.1 image over that? I've heard that knox won't even allow flashing custom recoveries, I'm pretty comfortable with ADB so that shouldn't be an issue.

If none of this is possible, anyone know a way to get any Samsungs with knox to accept unlock codes?

Thanks in advance guys
 
osugsxr
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Quote:
Originally Posted by wardlogan View Post
Hello,
I know this is a common issue, I haven't found any clear information anywhere I've looked though. I've got a M919 S4 that was OTA upgraded to 4.3 with MK2 baseband. Still stock, still unrooted. I ordered an unlock code from unlockcodesource, they give three codes to attempt, all of which failed. In the past, we would simply downgrade from 4.1.2 to 4.1.1 with Odin and navigate to the UMTS menu and unlock from there. Now after the 4.3 upgrade with knox, all codes are failing and I obviously can't use the UMTS menu trick because it only works on 4.1.1.

Does anyone know of some not so simple methods to downgrade without bricking? Can I root, flash a custom earlier version image and earlier bootloader, and flash the stock 4.1.1 image over that? I've heard that knox won't even allow flashing custom recoveries, I'm pretty comfortable with ADB so that shouldn't be an issue.

If none of this is possible, anyone know a way to get any Samsungs with knox to accept unlock codes?

Thanks in advance guys

Have you tried using chainfires region unlock , there is a xda version in the forums somewhere. You will need to root, but then trying the sim unlock code ?
Too many phones in the past year!
 
rlichtefeld
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Location: Atlanta, GA
You can root without tripping the Knox flag. You just can't install a custom recovery. That is what trips the Knox flag.

The way I rooted my stock 4.3 was this: http://forum.xda-developers.com/show....php?t=2611175

Rob
Current Device: Samsung Galaxy S4 (US T-Mobile SGH-M919)
Current Baseband: M919UVUFNB4
Current ROM: Stock 4.4.2 KOT49H.M919UVUFNB4
Rooted: [SGH-M919] CF-Auto-Root Knox counter tripped!
WiFi Tether Fix: Quick and Dirty: Enable Tether.

Previous Device: HTC HD2 (US - T-Mobile)
Radio: 2.15.50.14
Bootloader: 4EXTRecovery
Android Launcher: Exceller Multi Booth Launcher
ROM:
NexusHD2-JellyBean-4.2.2-CM10.1 V2.1 NativeSD
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