Con SETool se pueden convertir los CID49 BROWN a RED, de hecho es conveniente hacerlo para hacerles cualquier servicio; el procedimiento correcto es el siguiente ...

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IF YOU EVER ENCOUNTER BROWN CID49 phone with LOCKED OTP

DB2000/DB2010 procedure:

If SETool reports:
OTP LOCKED:1 CID:49 PAF:1 IMEI:359061000XXXXX CERT:BROWN
you MUST do following:

settings, UNCHECK "revert to red"
semc tab, CID CHANGE=current
add in firmware tab
for K750/W700 - eroms\w700red_erom.ssw.cry
for w810/z530/k310/k510/z550 - eroms\w810_erom_red49.cry

and press flash. Retail EROM will be written and you can service phone as usual.

NOTE! IF YOU NOT MAKE IT - YOU WILL KILL PHONE FOREVER.

DB2020 procedure:
(Not mandatory, like the above, but necessary to service the phone through SERVER)

UNCHECK "USE SERVER"
first, be sure your phone is cid49. (press identify and read "flash cid:49")
if not, go to "Empty Fill" tab, select CID49, press recovery - phone will be brown cid49
next, convert phone to red.
switch to SEMC tab, select correct model and select correct conversion EROM
(example - phone is k610, conversion EROM is eroms\k610_erom_cnv_brown2red.cry )
press flash.
your phone is RED and ready to flash using credits system.

It has been confirmed that the K610 conversion EROM works for the Z610 as well. It might also work for the W850/W710.