It is truly amazing to see the speed with which developments can happen here on XDA. You may recall that XDA moderator Chainfire was working on a patch to try and “break” the protected bootloaders in the Galaxy Tablets’ stock roms. Well, today he announced the release of the patch that will ensure that you don’t get locked out of your favorite pastime… flashing your device. A bit of background on this, the official updates from most manufacturers will prevent you from playing with the internals of your favorite devices. This is the case for most electronic equipment out there (game consoles, phones, etc). Samsung has not been the exception to this rule as they had created a locked bootloader that was included in releases of their newer updates. So, updating to versions JM* or KA* of the firmware will put you with that bootloader, locking you in the process. This patch allows the device to flash back to the JJ4 version of the bootloader, which is unlocked.
So far, the success rate of this patch is very good and people are using it with no issues. Please post some feedback to see if you are not having issues with this fix.
After a great many hours of researching, testing and coding, myself (Chainfire) and Rotohammer have come up with a patch that works on most devices (currently all known GSM Tab variants except the P1000L and P1000N Latin models), and flashes back unprotected JJ4 (T-Mobile ?) bootloaders. The app only patches when it finds protected bootloaders, and you have to press a button for that, so the app can also be used to look at your current status.
You can find more information in the patch thread.
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Thanks pulser_g2 for the tip!_________