Most of Yureka users are unhappy with Lollipop and want to get back to the good old CM11 ROM based on KitKat. But the major problem is that if you have updated your device to official Cyanogen OS 12, then you CAN NOT DOWNGRADE at all. That’s because Lollipop is a 64-bit OS and KitKat is 32-bit OS. Sadly, many Yureka owners weren’t aware of this and unknowingly downgraded to CM11 resulting in a hard brick, which means a total dead device without any solution.
Fortunately, a senior member ‘tirta.agung’ at XDA-Developers forum has now figured out an effective way to downgrade YU Yureka from Lollipop to KitKat (or from other ROMs under the same partition table). The procedure involves flashing the official CM11 fastboot factory image on Yureka which restores your phone to stock/ factory state. It has been tried by several XDA members and is confirmed to be working without any issues.
So we start this procedure by thanking "tirta.agung",because of him this whole procedure has been possible.
Note: This process will WIPE entire data on your phone, except any data stored on the external microSD card. Before proceeding, make sure your phone is charged and you’ve taken a backup of your important data.
~ This guide might not come useful if your device is already in hard bricked condition.
Disclaimer: Try this guide at your own risk! We won’t be responsible in case you break it.
Note: Follow all the steps carefully. DO NOT TRY to make a flash-all.bat file to flash the files automatically as that might brick your device.
Downgrading Yureka from CM12 Lollipop to CM11 KitKat –
1. Download CM11 KitKat factory image “cm-11.0-XNPH05Q-tomato-signed-fastboot.zip” (fastboot flashable package) or from here.
2. Download fastboot.zip. It contains Fastboot & ADB files.
3. Extract contents of the both the zip files in one empty folder.
4. Open “Command Prompt” from the folder where you extracted all the zip files. To do so, open the folder and right-click while holding down the ‘Shift’ key. Then choose “Open command window here“.
5. Boot Yureka into fastboot mode – To do so, power off the phone. While pressing the Volume UP key, connect the phone to PC/Laptop with USB cable. The phone should show “Fastboot Mode” screen.
6. After connecting the phone, go back to CMD window that you opened previously and type all the below commands (ONE LINE AT A TIME).
fastboot -i 0x1ebf oem unlock
fastboot -i 0x1ebf erase modem
fastboot -i 0x1ebf erase boot
fastboot -i 0x1ebf erase recovery
fastboot -i 0x1ebf erase aboot
fastboot -i 0x1ebf erase abootbak
fastboot -i 0x1ebf erase hyp
fastboot -i 0x1ebf erase hypbak
fastboot -i 0x1ebf erase rpm
fastboot -i 0x1ebf erase rpmbak
fastboot -i 0x1ebf erase sbl1
fastboot -i 0x1ebf erase sbl1bak
fastboot -i 0x1ebf erase tz
fastboot -i 0x1ebf erase tzbak
fastboot -i 0x1ebf format system
fastboot -i 0x1ebf format userdata
fastboot -i 0x1ebf format cache
fastboot -i 0x1ebf flash modem NON-HLOS.bin
fastboot -i 0x1ebf flash sbl1 sbl1.mbn
fastboot -i 0x1ebf flash sbl1bak sbl1.mbn
fastboot -i 0x1ebf flash aboot emmc_appsboot.mbn
fastboot -i 0x1ebf flash abootbak emmc_appsboot.mbn
fastboot -i 0x1ebf flash rpm rpm.mbn
fastboot -i 0x1ebf flash rpmbak rpm.mbn
fastboot -i 0x1ebf flash tz tz.mbn
fastboot -i 0x1ebf flash tzbak tz.mbn
fastboot -i 0x1ebf flash hyp hyp.mbn
fastboot -i 0x1ebf flash hypbak hyp.mbn
fastboot -i 0x1ebf flash boot boot.img
fastboot -i 0x1ebf flash recovery recovery.img
fastboot -i 0x1ebf flash system system.img
fastboot -i 0x1ebf reboot-bootloader
fastboot -i 0x1ebf oem unlock
fastboot -i 0x1ebf format userdata
fastboot -i 0x1ebf format cache
fastboot -i 0x1ebf reboot
7. After reboot wait for a while. Now Your device should be running on KitKat.
This is an easy way and shouldn’t take much of your time. After downgrading to CM11 you might soon get the OTA for Lollipop that you can simply ignore if you don’t want to install it.
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