C60 v2 stepped firmeware

I tried to flash back the OEM firmeware with so many methods, but all ending on brick device .

i strip the file with dd command ( as I read i must skip 257 ) And I try with 129 also

i used tftp.. ssh (mtd and system upgrade commands) and luci all failed

I solder the pines also for easy serial connection and I get the serial connection working but with no luck in revert back .

I will post the errors and logs hope to get help for this issue

regards