Downgrade iPhone 4 by installing old baseband chip?

[beerfoote1]

Hi,
Is it possible to unlock iPhone 4 by removing baseband chip and replacing it with an older baseband chip? I am very good with BGA works. If possible need to buy old baseband chipset.

Thanks

[ceckin]

Yes that's what the Chinese are doing, but replacing your BB means a new IMEI (which in a lot of countries is illegal).

More info:

http://www.*******iphonerepair.com/hack/iphone-4-baseband-chip-downgrade-from-4-11-08-to-4-10-01-service-available-soon/

[nnaeem11]

u have to change the same baseband chip with same ram on the board

It’s similar to our baseband chip replacement service for 3G and 3GS, but this method requires two different chips to be replaced – the Infineon X-GOLD 618 processor chip and the Intel/Numonyx 128MB NOR DDR chip.

[rogerboogie]

yes 100 % possible tested by me , the only problem is you must to change baseband & sd ram on board to avoid imei mismatch means 0499xxx imei,
when imei change to this 0499xxx you cant activate via itunes and you have to unlock using gevey sim also


the best choice but i dont know if its possible is to program the basband ic with 01.59 baseband and we can unlock viua ultrasn0w method

[raffi44]

hi all

question:

if i have old iphone 4 that was factory unlocked, can i use it and change basband chip (and that memory chip its the one right next to basband chip?)
will it work and i will have unlocked iphone 4??

other thing how to remove glue that is around this basband ic??

thx in advance!!

[validsyntax1210]

Basicly my question is can u take a bad esn phone change these two chips and make it a good esn phone? And if you change both these chips you said you cant use itunes with it at all?

[rogerboogie]

thats what i said

by changing BASEBAND PROSESSOR and NOR DDR you will change baseband and imei on this phone , FOR THE INFO STORED ON THOSE CHIPS , MEAN IMEI AND MODEM FIRMWARE

if you only change one of them you will get imei 0499xxx and you cannot activate trought itunes cause have non acepted imei

* THIS IS NOT A SIMPLE PROCESS , YOU MUST HAVE ADVANCED HARWARE SKILLS AND SPECIFIC HARDWARE FOR REBALL MICRO BGA IC`S , REMOVE GLUED IC ON BOARD, PREHEATER STATION, HOT AIR OR INFRARED STATION
, MECHANIC SOLDER PASTE , SOLDERING IRON , AND TOO MUCH EXPERIENCE ON IPHONE HARDWARE


HOPE IS CLEAR

[22mobiles65]

[QUOTE=rogerboogie;9118339]thats what i said

by changing BASEBAND PROSESSOR and NOR DDR you will change baseband and imei on this phone , FOR THE INFO STORED ON THOSE CHIPS , MEAN IMEI AND MODEM FIRMWARE

if you only change one of them you will get imei 0499xxx and you cannot activate trought itunes cause have non acepted imei

* THIS IS NOT A SIMPLE PROCESS , YOU MUST HAVE ADVANCED HARWARE SKILLS AND SPECIFIC HARDWARE FOR REBALL MICRO BGA IC`S , REMOVE GLUED IC ON BOARD, PREHEATER STATION, HOT AIR OR INFRARED STATION
, MECHANIC SOLDER PASTE , SOLDERING IRON , AND TOO MUCH EXPERIENCE ON IPHONE HARDWARE

101% i am agree with you thanks for share good exprince with us have any idea
one Q more iphone4 locked with at&t its factory unlocked.but after update
this not unlocked with any sim massage on itune PHONE COULD NOT ACTIVATED THIS TIME TRY LATER

[cyber_sonic]

its pointless to do this stuff.. i think it would be cheaper and hassle free to purchase official unlock rather than waste time with this until unless the baseband chip is totally bricked.

[validsyntax1210]

i reball ps3s this is alot smaller but i was able to get 2 chips off a junk board without messing them up so now i just wait for my ic stencils from china lol. i have all equipment sorry about dumb question it was mostly about itunes part and i misread if u change only 1 u cant use i tunes. Thanks for all the info guys

edit: yah cyber i think i do have a board with a bricked baseband kinda why i was asking

[firefox2011]

i like reading this thread

your questions and answers

makes informative.......

Thanks.

[lihua]

now work!!!!!!!!!

very good !!!!!!!!!!

[validsyntax1210]

thanks 22mobil i could not find the solder mixed in with the flux and u do have to type in MECHANIC SOLDER PASTE in the search bar on ebay to find it. Thanks again for all help ill let you know if baseband switch fixes -1 restore error if i dont screw it up!

[pharpalani]

iphone-4-baseband-chip-downgrade-from-4-11-08-to-4-10-01-service-available-soon/

[adaseb]

Originally Posted by pharpalani

iphone-4-baseband-chip-downgrade-from-4-11-08-to-4-10-01-service-available-soon/

I wish

Its impossible to downgrade the iPhone 4 baseband. IMPOSSIBLE!