How to check iBoot (bootrom) version

[pece1976]

iBoot is the bootloader on iPhone OS devices. iBoot acts on restore while iPhone is in Recovery Mode, iBoot makes sure that you are flashing a firmware version greater than or equal to a current one. If you are not, iBoot will not allow the restore to proceed. Because of this, firmware downgrading must be done in DFU mode.This means if you need to restore your iPhone to current version simply put the iPhone in recovery mode and iTunes takes care of the rest but if you need to downgrade your current firmware to lower one you need to put your iPhone in DFU mode.

The old iBoot version was 359.3 and the new version is iBoot 359.3.2.

There are a few methods to check which iBoot version you have:

1.Serial Number Method :

Check at the 3rd, 4th and 5th numbers in your serial number. If your serial number digits are "939" OR LOWER, its OLD bootrom. If you're serial number digits are "940" or HIGHER, its NEW bootrom.

but to be 100% sure

2. Using DFU Mode:

Windows:

1. Put your iPhone into DFU Mode
2. Right Click on My Computer > Properties > Hardware (tab) > Device Manager
3. Select the plus arrow for "Universal Serial Bus (USB) Controller"
4. Find "Apple Mobile Device USB Driver", right click and select Properties
5. Go to "Details" and find "Device Instance ID"
6. Scroll through the string and you'll eventually find the bootrom version (iBoot)
7. If it's 359.3 is OLD bootrom and you DO NOT require a tethered jailbreak. If it's 359.3.2 its NEW and you DO require a tethered jailbreak.

Mac:

1. Put your iPhone into DFU Mode
2. Open "System Profiler" and go to Hardware > USB (menu on left)
3. At the top right under “USB Device Tree Panel” click “Apple Mobile Device (DFU Mode)”
4. In the upper right corner look for the information “string on the Serial Number.”
5. At the bottom you will find the description BootRom version (iBoot).
6. If it's 359.3 is OLD bootrom and you DO NOT require a tethered jailbreak. If it's 359.3.2 its NEW and you DO require a tethered jailbreak.

[lousbeer]

Hi

Thanks for your response, is the serial number the IMEI number?

[pece1976]

go to Settings - General - About

you will find there Serial Number , IMEI is something else

[m abdelfattah]

Hello There

I am going to buy Iphone 3gs .. I checked the serial NO, its MC131 .. but I can't know the firm ware version unless I buy the phone

Am I in the safe side ?

[pece1976]

only firmware counts , if its with 3.1.3 no chance for jailbreak ATM

[m abdelfattah]

is there a chance that i can get the firmware version before i buy it .. the correct serial no is 88005WZF3NP

[pece1976]

is there a chance that i can get the firmware version before i buy it .. the correct serial no is 88005WZF3NP

that phone is made in the 5th week of 2010 (3rd number is a year , 4th & 5th week) , 3.1.3 firmware was released on February 3rd

[m abdelfattah]

5th Weeks is in January ! .. That means its 3.1.2 ? .. Is this a confirmed Information ?

[m abdelfattah]

Oh .. Finally I found a 3gs with firmware 3.1.2 .. but with a serial no, 949 "new boot rom "

Can I jail break now ? is it tethered ?

[pece1976]

take a look here
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[pepe wicho]

I reset my Iphone to its original factory settings due to be unable to jail brake it it would go thru all the steps on blackra1n but once it reboot the cydia app would never show so I thougth by resetting it would let me jail brake but it upgrade it to 3.1.3 so it doesnt let me do anything now except when I try to make it rain my screen goes blank and stays that way, is there something i can do? or am I doing something wrong?

[pepe wicho]

I believe I have the old bootrom version my serial number starts with 84912 can it be jail brake again? or why the cydia app would never show after blackra1n rebooted?

[pepe wicho]

thanks for your help i really appreciate it!!!!

[pece1976]

Please guys dont "hijack" topics , this one is for checking bootrom , for other stuf please search the forum , if you cant find what you search open new one.

@pepe

take a look here: You are not allowed to view links.
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If your phone was jailbroken on 3.1.2 or earlier and you have saved SSH on file on Cydia before restoring to stock 3.1.3 we can continue discussion about your problem there , tell us more.