here is flash file for z540
Click Here
How To Flash :
0- IMPORTANT : MAKE SURE PHONE HAVE ENOUGH BATTERY FOR FLASHING.
1- Active “Full Download , prg will ask “Change Bo”ot Code ??”. Press YES. Click Boot_Folder , and brower to Z540 Firmware Folder. Prg ask “Change boot file ?” Press YES. Select VMSZT, Rsrc… like in pic.
2- Phone power , hold 9 and press power button, phone will go in FlashMode : Screen show light-blue color. If phone show yellow color , take out battery and try again.
3- Connect phone, which already in FlashMode to PC, install the driver needed.
4- Click APPLY button. When The Program show CONNECTED, press download to flash phone.
5- Wait until program show Complete. Phone will auto power on.
6- If phone show some error, flash phone again and all will be fixed.
7- Wait 2mins, phone will show Format , restore FS. COMPLETE!
Regrads