eeprom checksum , mcu rom checksum !!!!! - GSM-Forum

makona · 01-23-2001, 12:50

i have this :
1 - 3310 contact service ver 3.24, wintesla tests result is : MCU ROM CHECKSUM (Failed) .
2 - 8210 contact service ver 5.16, wintesla tests resul is : eeprom sec checksum (Failed) .
( i tried on 8210 contect service repairer by X-Shadow but i got eeprom Empty , when i tried with another working phone and its ok )

i need to know :
1 - whats the diff between MCu rom checksum and eeprom sec checksum .
2 - contact service repairer by x-shadow will work with which ? ( is it eeprom sec checksum ? )

Thanks All

X-Shadow · 01-23-2001, 15:24

Hello Meshoz,

Yes, security checksum is in EEPROM... But
for 8210 EEPROM is emulated in flash, so you
can fix this without opening unit by
following my instructions. But if you say
EEPROM is empty, why empty??? is it FF FF FF
FF FF FF or something else??? Maybe you
just need to put soldering flux around the
BGA ICs and heat it with hot air set at 2.5.
Most of 8210 I fix have this problem, but all
is ok after heating the BGA Chips.

For 3310, there is a solution for your
contact service unit. Please do not try to
put different flash from different phone
or else you will destroy it like what you did
to your 3210. Email me, and I will tell you
how to fix it...

Best Regards,
X-Shadow

Charly · 01-23-2001, 18:22

Hi X-shadow

I have same problem with 6130 4.15 "CS" Wintesla says MCU ROM Checksum Fail Is this repairable I have Original Backup 20000-40000
And byte for byte is the same as Phone but still gives "CS" Can you help its nott urgent its just educational to know why this has happened.

Cheers

Charlie

Leeloo · 01-24-2001, 19:52

Hi Meshoz and x-shadow,

im very intressted in x-shadows contact service prog. does it work ?
i would be very happy if any of you would send it to me

------------------

[This message has been edited by Leeloo (edited 25 January 2001).]

Devils-thoughts · 01-24-2001, 20:46

to x-shadow

can you mail the prog pls i have i 3310 that say contact service

thx

Aldrin · 01-25-2001, 00:44

Hi,
Can someone help me, I got a 3210 in Contact service after partial flashing.I've got back-up from 200000~4000000 and flash it back to phone but phone is still in "CS".Has someone have solution on this.

Pls.. HELP!!!

[email protected]

01-23-2001, 12:50	#1 (permalink)
makona No Life Poster Join Date: Nov 2000 Location: EGYPT Age: 44 Posts: 1,202 Member: 2583 Status: Offline Sonork: 100.88702 Thanks Meter: 203	eeprom checksum , mcu rom checksum !!!!! i have this : 1 - 3310 contact service ver 3.24, wintesla tests result is : MCU ROM CHECKSUM (Failed) . 2 - 8210 contact service ver 5.16, wintesla tests resul is : eeprom sec checksum (Failed) . ( i tried on 8210 contect service repairer by X-Shadow but i got eeprom Empty , when i tried with another working phone and its ok ) i need to know : 1 - whats the diff between MCu rom checksum and eeprom sec checksum . 2 - contact service repairer by x-shadow will work with which ? ( is it eeprom sec checksum ? ) Thanks All

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01-23-2001, 15:24	#2 (permalink)
X-Shadow No Life Poster Join Date: Jan 2000 Location: GSM Forum Posts: 1,108 Member: 871 Status: Offline Thanks Meter: 602	Hello Meshoz, Yes, security checksum is in EEPROM... But for 8210 EEPROM is emulated in flash, so you can fix this without opening unit by following my instructions. But if you say EEPROM is empty, why empty??? is it FF FF FF FF FF FF or something else??? Maybe you just need to put soldering flux around the BGA ICs and heat it with hot air set at 2.5. Most of 8210 I fix have this problem, but all is ok after heating the BGA Chips. For 3310, there is a solution for your contact service unit. Please do not try to put different flash from different phone or else you will destroy it like what you did to your 3210. Email me, and I will tell you how to fix it... Best Regards, X-Shadow

01-23-2001, 18:22	#3 (permalink)
Charly No Life Poster Join Date: Sep 2000 Location: UK York Age: 56 Posts: 730 Member: 2008 Status: Offline Thanks Meter: 4	Hi X-shadow I have same problem with 6130 4.15 "CS" Wintesla says MCU ROM Checksum Fail Is this repairable I have Original Backup 20000-40000 And byte for byte is the same as Phone but still gives "CS" Can you help its nott urgent its just educational to know why this has happened. Cheers Charlie

01-24-2001, 19:52	#4 (permalink)
Leeloo Crazy Poster Join Date: Dec 2000 Location: Sweden Posts: 53 Member: 2806 Status: Offline Thanks Meter: 0	Hi Meshoz and x-shadow, im very intressted in x-shadows contact service prog. does it work ? i would be very happy if any of you would send it to me ------------------ [This message has been edited by Leeloo (edited 25 January 2001).]

01-24-2001, 20:46	#5 (permalink)
Devils-thoughts Freak Poster Join Date: Dec 2000 Location: netherlands Posts: 151 Member: 2881 Status: Offline Thanks Meter: 0	to x-shadow can you mail the prog pls i have i 3310 that say contact service thx

01-25-2001, 00:44	#6 (permalink)
Aldrin Insane Poster Join Date: Nov 1999 Location: Cebu City,Philippines Posts: 87 Member: 682 Status: Offline Thanks Meter: 0	Hi, Can someone help me, I got a 3210 in Contact service after partial flashing.I've got back-up from 200000~4000000 and flash it back to phone but phone is still in "CS".Has someone have solution on this. Pls.. HELP!!! [email protected]