CX7i - freseed on 37% WinSWUP - many phones

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we recive many phone CX7i

have WinSwup - flash phones - all ok with 70-75%
last 25 % STOP on 37 % erase and frezeeeeed

phone work properly after winsup - no problem
i think win swup no work

we recive phones with sw v 43 and flash to sv v 50

i open phone - what flasn and stop - phone have another flash chip

i use Martech

i read full flash from worked and russian phone
i read lang pack from worked phone

and flash lang or full flash with Martech SW to frezeed phone - after this
phone not power on

what solution ?

please HELP

i test WinSwup v 54 - no works too - stop and freeezed at 37%