FAQ from MOBILE-FILES.COM

[GSM™]

q:
when i attaching phone using dcu60 i see following messages:

erom_readvar: error reading unit 1/725
error while reading security units
SECURITY UNITS CAN'T BE READ !
DAMAGED FIRMWARE/GDFS OR EMPTY PHONE

or

erom_readvar: error reading unit 1/851
error while reading security units
SECURITY UNITS CAN'T BE READ !
DAMAGED FIRMWARE/GDFS OR EMPTY PHONE

and process stops,but phone works normally on com/ufs.
what is root cause and what is solution ?

A:
that phone is tampered by dreambox software.

during their "famous' method of "testpoint bypass", they writing patched erom with own custom loader embedded, patching simlock signature check and ... erasing simlock signature without any reason, which prevents setool2 from making backup.

i had write a post on their forum, but they too arrogant even to read it.

fix is extremly simple:

using com/ufs write next script in SIGNED MODE (check ONLY "USE SIGNED MODE" on settings)

for db2020:

gdfswrite:0001085144554D4D5944415441

for db2012:

gdfswrite:0001072544554D4D5944415441

alas, they custom loader also breaks alternative bypass support using dcu60 cable,
so you only can use SIGNED MODE with dcu60 after their "testpoint".

i suggest to use setool2 reset method to put proper erom instead of tampered one.