"Invalid calibration data in device tree & eeprom is blank"


Source : GeeZuZz
Source add : http://www.hackint0sh.org/forum/showthread.php?p=81893

When a phone is unlocked (in a proper way), it will always be unlocked. Firmware upgrades never touches EEPROM, including lock data.

Here are my thought's on how iphone unlocking works - of course, it's just my thoughts based on my experience with other phones, and i may very well be wrong.

IPFS unlock solution is permanent, and will handle all future updates
Yes, i'm fairly sure that a phone unlocked with IPFS is a proper unlock (not firmware patch), making it permanent. But of course, unlike other's, iphone needs activation and IPFS therefore completely dependent on activation, which is depending on jailbreak. But when it comes to the operator lock itself, IPFS's permanently unlocks it.

I'm not sure exactly how IPFS does unlock it, but i'm feeling very sure it's one of these:
1. IPFS reads data from the baseband/EEPROM, and rebuilds the lock area in EEPROM with proper data - without any lock. This is exactly the same done on almost all other phones.

2. IPFS patches the baseband, but only as a temporary step in order to achive the above. When it's finished, it doesn't matter if the patch is removed (bb upgraded), because phone is already unlocked.

AnySIM and the other solutions are fimware patch solutions and will never survive baseband flashing/upgrade. Unlike IPFS (if IPFS also patches firmware), AnySIM patches firmware in order to bypass the lock, not in order to unlock it - or at least it's not unlocking it properly. The fact that anysim unlocked phones are bricked after upgrading, must be caused by changes the anySIM solution does to EEPROM, which is not properly done, and makes it "corrupted" as seen from the new firmware.

In my opinion there's no reason to be so negative about IPFS. They did the real unlock and so far noone have been able to recreate their solution. So don't expect a free real solution for 1.1.1 appearing very soon either. A free patch-unlock though is probably already possible now that they have decrypted the ramdisk, i will try that tomorrow. Of course iphone dev team are doing the most important work, and let's hope they soon will be able to work out a direct unlock solution as well.

hmmmm.....Maybe IPSF/GeoIPSF Startup script will help?

It's all a question of trying... The number of phones with "Invalide Calibration error" is growing every at a rate never seen before. Something is causing this.

I have my iphone in this stat for a about 2 weeks. after using the refurb option on Ziphone

I have 1.1.4 OTB iphone but I dont have the original sim, will it work if I insert any other sim for j/a/u process? Or original sim is must??
Plz reply asap!!

Nah, it's there, implied with Jailbreak, AFC2 is always applied when ramdisk is booted.

Good point, maybe we can arrange a solution for it.

I think this Topic "Invalid calibration data in device tree & eeprom is blank" should be FIX!

dont quote me on if the original sim is needed... I only did this as from the old days of 1.0.0 on a US iPhone I previously had, the AT&T sim was needed for some unlocks such as the TurboSim method. I suppose it cant harm the iPhone if there was no sim inserted or the sim you intend to use is inserted...

can anybody clarify this?

Amz

Thanks aviegas!

Pls help ppl like us! hehe...
pls pls look into this >>> http://www.hackint0sh.org/forum/show...&postcount=486

TESTED and WORKED!

Thanks again!

Any ideas about why some people end up NO WiFi problem?

Couldnt possibly say. I think some people do not read the instructions properly or they do not understand what they are doing. I am not an active posting member on this forum, but I have spent lots of time reading since ownership of the iPhone back in June last year.

I myself wouldnt try anything unless I understand the exact thing I am doing and what implications it may have. I have not had a problem yet, and I have unlocked quite a few phones now for friends, family and collegues without a problem.

I guess people just rush and miss out a step, and all of a sudden things go wrong. I notice nobody mentions what they did before the wifi stopped working or what steps they took... doesnt help diagnose the issue.