How to Downgrade ASUS Zenfone 5 A500CG from Lollipop 5.0 to Kitkat 4.4

Today ASUS Zenfone Blog will show you How to Downgrade ASUS Zenfone 5 A500CG From Lollipop to KitKat.

Downgrade Step (From L to KK)

1. Download the downgrade tool: UL-ASUS_T00F-TW-5.2.2.2-user.zip
2. Using MTP connecting ZenFone5 with PC. (Enable MTP: Setting-->Storage-->press the USB icon on right corner--> Enable MTP)
3. Copy file UL-ASUS_T00F-TW-5.3.3.3-user.zip to the ZenFone5 internal storage.
4. Remove the USB cable, the device will pops up the system upgrade information.
5. After finished, device will auto reboot and perform factory reset.
6. Then copy file UL-ASUS_T00F-TW-5.2.2.2-user to the ZenFone5 internal storage again.
7. After downgraded, device will auto reboot and perform factory reset.
8. After finished, please go to Settings->About-> software information->Build number. The version should be V2.21.40.44

ZENFONE 5 Downgrade Version
TW VERSION

Description

ASUS ZenFone 5(A500CG/A501CG) downgrade SOP (Downgrade from L to KK), V2.21.40.44 Only for TW SKU* Notice: 1. Please must to download the UL-ASUS_T00F-TW-5.3.3.3-user.zip/UL-ASUS_T00F-TW-5.2.2.2-user.zip to perform downgrade procedure. 2. Only apply to same SKU update, Example: WW->WW, CN->CN, TW->TW. 3. Software update cannot transfer the software SKU and downgrade the software version. 4. Downgrade image will only revert back to latest KK version 5. After OTA downgrade, device will perform factory reset automatically.then reboot automatically to complete upgrade process 6. System upgrade may cause part of data missing, please buckup your important data before system upgrade

File Size	750 MBytes                                                                              2015/05/28
Download from	Global

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