This guide is based on the work of halfevildruid and his thread for unlocking GSM for Photon users on 2.3.4 with unlocked bootloaders. All users should take the time to carefully read through that thread here and keep in mind that it was written for 2.3.4/unlocked bootloader users. Some files and steps in that thread will not work on Photons that have had the 2.3.5 OTA applied.
Before You Start:
Doing this will remove the domestic GSM carrier lock on the Sprint Photon running 2.3.5 OTA. This process will most likely break your ability to return to Sprint service, so please DO NOT DO THIS if you want to keep your Photon running on Sprint. There are ways to fix this, but none have been tested on 2.3.5 OTA devices. As far as I know, this method has been confirmed to work on three phones (including mine), so consider this experimental and high risk. I am not responsible for bricked phones, warranty issues, cats chasing dogs or hot snow falling up if you try this.
Things You Need:
1.Windows PC (tested on Win 8) with the following software installed:
-Motorola USB Drivers [Download]
-RSD Lite [Download]
-ADB Tools/Android SDK [Download] (Not really necessary, but helpful if you have USB issues.)2. Micro USB cable and wall charger (needed for bootstrap recovery)
3. Standard (full size) SIM card for US GSM network. (ATT/T-Mobile/Straight Talk)
4. Micro SD card (not necessary, but good just in case)
5. Motorola Photon running 2.3.5 OTA ONLY
Files You Need:
1.Full US Cellular Electrify SBF [Download][Download] [Download][Download][Dev Thread/Download]
-HybridGBv20locked.zip6. KDDI Radio [Download]www.motosunfire.com.
1. Backup Your Stuff!
2. Shutdown phone and remove SIM/SD card (if applicable)
-Tip: Leave your battery cover off. There’s going to be a lot of battery pulls…3. Open RSD Lite on your computer.
4. Start phone in RSD mode:
-With phone unplugged hold volume-down and power5. Select the full US Celluar SBF in RSD lite and press start.
-It should say fastboot in the top left corner, press volume-down until RSD appears
-Connect phone to computer
-Press volume-up to enter RSD mode
-This process takes a few minutes and will end in an error, this is normal.6. Once you are in RSD mode again, flash the Unbrick SBF
-The phone may hang on the dual core screen, if so pull the battery.
-The phone will either do two things:
-Bootloop with the US cellular logo-In either case, pull the battery and follow the steps to enter RSD mode again.
-Boot normally to home screen
-This should not end in an error, but RSD may say you need to manually reboot your phone, this is normal.7. Once you have flashed the two SBFs, you should be able to get to the stock US Celluar rom.
-Once your phone reboots you may experience bootlooping, if so do a factory reset (See below)
-With the phone off pess vol-down + power
-Press vol-down until Android Recovery is shown, press vol-up to enter.
-Press both vol-up + vol-down to see menu.
-In the recovery screen, use the volume buttons to scroll and select factory restore.
-Press power to wipe the phone.
-When complete, reboot phone and you should successfully boot to home.
8. After everything has loaded, you need to obtain root access. (See below)
-Make sure all USB drivers are installed on your computer.9. Once rooted, place the KDDI zip and Peetr’s ROM on either the internal or external storage.
-Enable USB debugging mode on phone (System>Applications>Development)
-Unzip the su.zip on your computer and open root.bat, the program will take you through the rest.
-This is also a good time to install your SIM card.10. Install the Bootstrap recovery and follow the instructions to boot into recovery.
-Remember: You need to be on AC power to get into Bootstrap recovery.11. In recovery, flash the KDDI zip and then Peetr’s ROM
12. After installing the ROM, flash KDDI again.
-Flash KDDI as many times as you want, it will give an error but will still work.13. Reboot phone and enjoy the GSM radio.
-If you bootloop again, just do another factory reset. Peetr’s ROM will still be there.See next post for Q&A
-You may have to root and install Bootstrap again.
-It never hurts to flash KDDI one more time just to be sure.