OK,
download the following files:
A62 firmware 06 language pack 98 (multi flash files):
http://www.4shared.com/file/113880507/7a5030b4/a62_v06_bootcore.html
and/or
A62 firmware 07 language pack 91 (single flash file - use only the 8MB fullflash):
http://www.4shared.com/file/96828339/2ef500b8/A62_07_AMD.html
I propouse to use the last Joker software:
http://www.4shared.com/file/88732412/b140adf5/Joker_0356c.html
So, open Joker, select Type; A60/A62, comport 1 or 2, COM Speed: 115200 and bootcore Typ: Normal. Go to flash menu, select FullFlash, check only ReCalc Keys and click to Write. Select fullflash file (file with 8MB dimension) and wait to finish.
I propouse to try first to flash only bootcore area (to not loose your stored files). Use flash file "A62_80-01_BC_bcore.bin" from the "a62_v06_bootcore.rar" archive. Set in the Flash menu "BCORE" option and remain checked only ReCalc Keys option. Wait to finish and enter in Service Mode to see if is OK (phone status Factory Mode). After try to start normarly your phone. If not working, remain to fullflash everything (Bootcore, EEprom,Language pack) using 8MB fullflash file.
dagos