S4 Bootloader

The raw exploits to work around the locked bootloaders on some Galaxy S4s is released

On the heels of the release of the Galaxy S4 on Verizon, Android security researcher Dan Rosenberg has released the tools and files needed to work around the bootloader security of the AT&T and Verizon versions of the Galaxy S4. Unlike the other versions of the S4, the versions built for America's two biggest carriers have an extra security layer at the bootloader level, which makes it a bit difficult to flash a custom recovery or boot image to the device.

Rosenberg's tools work around these issues, and allow the user to flash custom kernels and recoveries on the AT&T and Verizon branded Samsung Galaxy S4

It's worth noting that these aren't for the novice, so you might want to wait a day or two to see what other developers can build using the new bootloader tools. Hopefully, something simple and sane can be made for those folks who want or need to do a little magic on the software of their Galaxy S4. See the links below for more information.

Source: XDA; Azimuth Security. Thanks everyone who sent this in!

There are 14 comments

romma says:

Dan Rosenberg is rocking Moto and Samsung Bootloaders these days.

munnarg says:

Hmm i just might go get one now.

hmmm says:

I love it. Imagine the money these companies have paid to implement the security on these phones that a minority of people will really do anything with. And that security gets cracked immediately. Great job to the people who make this happen.

SlimJ87D says:

If anyone has to pay full price for a SGS4 for AT&T, just get the T-Mobile version instead. Bootloader is unlocked, works on AT&T's network.

munnarg says:

Does it get LTE on AT&T's network?

SlimJ87D says:

Yes, it supports 6 bands of LTE, 4 of those are AT&T's bands.

It is Quantabanded as well.

AT&T: http://www.samsung.com/us/mobile/cell-phones/SGH-I337ZWAATT-specs
LTE: Bands 1/4/7/17; HSPA+/UMTS: 850/1900/2100MHz; GSM: 850/900/1800/1900MHz

T-Mobile: http://www.samsung.com/us/mobile/cell-phones/SGH-M919ZWATMB-specs
LTE: Bands 1/2/4/5/7/17; HSPA+/UMTS: 850/AWS/1900/2100MHz; GSM: 850/900/1800/1900MHz

And easy unlocking method for T-Mobile here, you just do dialer codes:

So if you are going to pay full price, then get the T-Mobile one. If you upgrade, might as well sell your phone for $600 and pay the extra price to get the T-Mobile version if you are into flashing.

barondebxl says:

But then you need to get it sim unlocked. Also can you flash I9505 roms on the T-Mobile version?

SlimJ87D says:

Read my post above, SIM Unlock is as simple as messing with the dialer codes and can be done in less than a few minutes.

ROMs are being ported over. I believe Wanamlite was ported over. It will not be difficult once we understand what needs to be changed, most likely just modems and kernels.

barondebxl says:

Oh my bad, didn't read it thoroughly. Thanks bro!

s44 says:


atlharry says:

Too bad there isn't going to be a Verizon version of the Google Edition S4. I'd just get this on contract and flash that image (essentially). Sigh. Why must I love my unlimited data so much?

SlimJ87D says:

REMOVED and repasted above

barondebxl says:


asarathy says:

So does this basically mean we can turn an AT&T S4 into a 'with google' one once it's released? Also if that's the case, can we buy the 32gb or will the images only work with a certain storage size?