Problem with Second mcu(SIM B) for CECT t689?????
 

2nd sim doesn`t work.First it indicates emergency then turns off,I`m trying to format the second mcu but i cannot.
CPU iD:6205-8B
size:4mb
Pinout: RX_B , TX_B and GND.

TRY RXA TXA AND GROUND.

FOLLOW STEPS

FORMAT
FULL BACKUP
FLASH
HARDWARE.

b.r.
ultimate.

The RX_A TX_A and GND is for the first cpu(6226 based),the first cpu(SIM A)it goes very well.
my problem is in the second cpu (2nd SIM,cpu id:6205 based) I want to format it and repair imei,because CECT T689 it have TWO CPU MTK
is 200% SOFT.

hi friend, the firmware off your phone is not supported yet , so you cant flash it, but you can format it ...format possible resolve your problem....

hi friend,I think that the second CPU is not supported yet.????!!!!!!!

You make connection to second MCU

Yes I make connection to second MCU.TX_B RX_B and GND+Power_B to separate the boot.tested

Hi mates i have also same problem with CECT T689 its working with only 1 sim card not working both sim card how can i solve this problem i have #pcs CECT T689 with same problem i formet the phone but still same please help me anybody

THANKS
NASMI

For other CPU is other pinouts

i dont think so cause i have repaired many N82 and 5700 and ZT588 with like these problems like SIM A ok SIM B not registred
or reboot or emergency and i ve read many threads about this probleme and finally i ve found the solution

1- connect on one cpu usualy A
2- format
3- repair emei

thats all

and i ve tried many things succesfully like i ve written a diffrent imei even with 000000000000000 but we must i say must change it from this imei i think it ends with xxxxxxxxxxx1220 something like this because this make sim not registred
and i ve revived many N95 with deffrent firmware with N95 BLUETOOTH FULL BKP

THX MULTIBOX

thanks for sharing i ll try this sulotion today.

Thanks for nice and helpfull info there.

I have try this but no succes,the probleme is in the second CPU,it is necessary to format it and repair emei but the second cpu is not supported yet by MULTI-BOX.so we wait for a Boooob update for the second CPU.
Good like MULTI-BOX Team:)

OK, we will work on solving your problem! :)

i think there s something about that probleme cause in all the phones i opned with two mcu i find always near RXa TXa RXb TXb
and gnd there s POWER A and POWER B
so i ve tried to connect powerA TO + OR - when i want to read mcu A
same thing in mcuB
BUT NO SUCCES
so till now ive repaired many phones with such probleme with the same solution connectig to one cpu only

untill this afternoon i ve received one N82I from a freind without any probleme and when i insert *#06# i get two deffrent
IMEIs so i opend it to read full backup i succeeded in only one cpu A for the other one no
my multi box had read only one cpu and on the soft window on info it shows one IMEI of the two got on the phone s display

to be contenued