HTC J butterfly HTL21 Flash Room Stock RUU

HTC J butterfly HTL21 Flash Room Stock RUU


After S-OFF, if you make SIM free, the display will be in Chinese and English. If you install Morelocale 2 you can also display Japanese, but there seems to be problems such as frequent data communication. Therefore, if you do this procedure, you can return to the original 1.15.902.1 version ROM of Japan. Then, while maintaining the SIM free state, stable communication can be performed and Japanese can be displayed comfortably.
Note: This method is not guaranteed. As a result of following this method, even if you incur unrecoverable damage to your HTC J Butterfly, even if huge communication costs occur, please handle any other events at your own risk.

Room Flash HTC J butterfly HTL21 :

This method has been confirmed with Windows 7 (64 bit version, 32 bit version). Windows XP 32 bit version seems to be no problem. It does not work on Windows 8.
In this way, all data of HTC J Butterfly will disappear. Please back up in advance if necessary.
Procedure for returning to ROM in Japan

1) Download the following file.

2) Execute steps 1 to 6 of "2. SIM Free" to open a command prompt.
3) Copy the file of (1) to the folder of 2. and change the name to PL99IMG.zip s.
4) Open a command prompt, type the following command and press Enter:

adb reboot bootloader

5) HTC J Butterfly will then enter boot loader mode. Then at the command prompt on the PC side, type the following command and press Enter.

fastboot oem reboot RUU

6) Then HTC J Butterfly will restart and enter the special mode called RUU. Eventually the hTC logo will be displayed on the screen.

7) When the hTC logo is displayed, type the following command at the command prompt on the PC side and press Enter.

fastboot flash zip PL99IMG.zip

8) Then it takes a long time for the next process, so wait for a while. As soon as the message FAILED (remote: 90 hboot pre-update! Please flush image agin immediately) appears on the PC side, type the command in 7. again and press Enter.


9) Then wait for a long time again. Then, a progress bar is displayed on the HTC J Butterfly side, and "finished" appears on the PC side soon. Although the progress bar stops halfway, you can type the following command on the PC side and press Enter.

fastboot reboot

10) Then it takes a little longer, HTC J Butterfly restarts. When restart is completed, HTC J Butterfly returns to the state at the time of purchase. .

Other small techniques :

Partition map
Type cat / proc / emmc in the adb shell to see the list of mounted partitions.
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