How to install old bootloader on Samsung Galaxy S2 to enable USB Jig?

Why USB Jig can’t reset custom binary download counter on my Samsung Galaxy S II? Hey, USB Jig is not working… Well, you might get a faulty USB Jig in this case but unlikely. Most likely, you have new bootloader that prevent USB Jig to reset custom binary download counter on your Samsung Galaxy S2. So how to reset custom binary download counter in this situation? Simple, install old bootloader on your Samsung Galaxy S2. And your USB Jig is back to business then.

How to install old bootloader on Samsung Galaxy S2?
The old bootloader installation process is the same as firmware installation using Odin. You can put the old bootloader tar file on either PDA or BOOTLOADER section. Then flash it. You can install new bootloader back after reset the custom binary download counter. But not necessary because nothing new in the new bootloader except disable USB Jig usage. Do visit XDA website if you need more information.

Installation guide – How to install firmware on Samsung Galaxy S2 with Odin? (Video)

Download old bootloader for Samsung Galaxy S2 I9100 here.


  1. Hi jayce,

    Could find the right topic for this so posting here…i am experiecing low mic volume while making calls on my SGS II. People on the other end keep asking me to speak up..Is there any fix for this?

    Am running stock 2.3.5 KI3

    Thanks in advance!!

  2. hi i have a bootloader problem my samsung s 2 while i was flashing a rom it switched off the phone and it won t start again with a usb jig can i fix the problem????

  3. i had updated my s2 via kies to 2.3.6 before..
    and now i had rooted, i tries to plug in usb jig and reset binary count, but it doesn’t work,
    did i need to flash back to the stock firmaware before I install old bootloader into my phone?
    or I can straight install old bootloader via odin at “bootloader” section without reflash to stock firmware?

  4. Hi Jayce.

    First wanna say tnx for great guides, you rock. Im about to flash old bootloader for my sgs2. I requested the file on xda and received a file called “GTI9100 old bootloader. If I extract it I receive a file called sbl.bin. Should I put the unextracted file called old bootloader or the extraxted sbl.bin in PDA and flash?

  5. Hi jayce!

    Do you have a link of the New Bootloader? I would like to install it back after resetting binary counter. Because I’m afraid the samsung guys might notice that I change something from stock. hehe πŸ™‚

  6. Hey there, before flashing bootloader do I need to clear cache ect or can I just put the phone straight into download mode and flash old bootloader? Cheers Andy

      • Sorry not the link but oden didnt recogise the file it in pda or bootloader just managed to get a working one though and have flashed it back to old and now the jig works πŸ™‚ but check it out as I couldnt get that one to work. cheers Andy. Thanks for your help m8. bring on icecream sandwich when it comes out eventuallt lol

      • Hi Jayce, you told me you’ve been using it while testing ICS.
        Are these ICS flashed through CWM or Odin?
        Because using CWM, the custom firmwares don’t have the bootloader file, so I tried here and there’s no problem (I flashed an ICS custom firmware through CWM using GB 2.3.6 and it worked).

        My question is, have you tried flashing an official ICS firmware through Odin (PC version) and later used the old bootloader through Odin too? ’cause official ICS changes the bootloader file.

        Many Thanks!

  7. Hi mate, if i install the old bootloader does it go in the bootloader section in odin and after i have finished with the old bootloader how do i get back to my original bootloader cheers.

    • Yes, it goes into bootloader section in Odin.

      I believe If you flash a new rom, like ICS, you’ll get the original back.

  8. Hi Jayce,
    I’m just wondering if you could give me some advice please mate?
    I am running 2.3.6 XXKI4 and I tried to install CM7.1. I forgot to Wipe Cache/Factory Data before installing and the phone got stuck in a boot loop. After a bit of a panic I thought I would re-flash the stock firmware. After that continually failed it got stuck on a screen saying There was a problem with the firmware upgrade. Please enter emergency recovery mode through Kies. Obviously that didn’t work. After numerous heart attacks I restarted the computer. Once that had re-booted I tried to reflash the stock firmware with Odin while holding my breath in anticipation… Success!!!

    Now it is all back but the custom binary count is at one. I tried the USB jig that I bought off eBay but it didn’t work. I saw this article so I used Odin to install the old bootloader but it still won’t work.

    Any suggestions???

  9. Hey jayce could u do a tutorial on how to flash back to new bootloader after flashing old bootloader for warranty purposes?

  10. Hey Jayce, Just wondering if this is how to install.
    1) Put SGS2 In Download mode.
    2) Put the GT-I9100_OLD_BOOTLOADER.tar.md5 in PDA or BOOTLOADER
    3) Flash it then i finish?
    4) use USB JIG to reset the CUSTOM BINARY DOWNLOAD thingy.

  11. hi jayce,
    im new with updating softwares for my galaxy s2. apparently the older version of gingerbread has been removed and cant put in the ics. the phone is showing its boot screen and is stagnant. i cant use odin to upload a new bootloader as its not detecting my phone. wat can be done???

  12. Hello guys, my SGS II GT-i9100 soft bricket.
    Still can open odin mode, have yeallow triangle, but phone dont boot to using state.
    Tryed to instal old bootloader , but it fails

    Odin v.3 engine (ID:3)..
    File analysis..
    Get PIT for mapping..
    Firmware update start..
    NAND Write Start!!

    Complete(Write) operation failed.
    All threads completed. (succeed 0 / failed 1)

    USB jig not working, its just turning on factory mode and noth.
    Tryed instal 2.3.4 and 2.3.5.

    any sugestions what to do? :/

  13. i cant get any of that from xda-developers πŸ™ download links dont work (files deleted)
    besides, dont remember what version my sgs II i9100 version is
    I bothet it from sweeden in 2011/09

    Can t you paste link where i can download stock firmware

  14. Anyone ho have problem below, atention.

    Odin v.3 engine (ID:8)..
    File analysis..
    Get PIT for mapping..
    Firmware update start..
    Complete(Write) operation failed. All threads completed. (succeed 0 / failed 1)

    Try reinstal samsung drivers, try instal from another PC,
    use this drivers

    dont instal kies at all

    Reeapiting, if you CANT instal any kernel, any firmware and phone freezes on Yeallow triangle, try another PC, reinstal Drivers.

    ps. fynaly after 2 months i can use my phone again πŸ™‚

  15. i have samsung sgs2 gt-i9100 on 4.0.4 …after rooting thru odin got yellow triangle…can i flash old boot loader to reset binary counter? Many thanks…..

  16. Dear Jayce my camrea on sgs2 after rooting not showing object in screen although able to click the photo and galary app not able to open storage and says sd card not mounted even though sd card is mounted…. do i need to reinstall 4.0.4 firmware ….please help

  17. Dear Jayce ….as i am new to rooting i followed some post and successfully rooted it but cwm was missing so i followed this post

  18. this worked first time plus cwm was installed when phone restarted and i didnt need to reinstall any apps.) after some time i notice camera issue…so i am not really sure which step might have caused this issue.

  19. Dear jayce …thanks a lot ..factory reset couldn’t solved this problem so i have installed resurrection remix 3.1.3… camera and gallery working normally…

  20. hi there
    i rooted my galaxy s2 and tried to unroot it later to update the software, but unfortunately it did not work and i have got a fixed screen on my galaxy that shows a mobile device and a computer with a yellow triangle inbetween.
    i tried usb jib but no luck
    what should i do

  21. My SGS2 is totally dead and I cannot enter the download mode at all ……
    Whats the wrong with it ? How to fix ?
    I flashed the wrong firmware( SGS1 ) to my phone ( SGS2 )and then it becomes bricked …..

  22. hi jayce, so I currently on jelly bean 4.1.2 xwlss. I updated from sammobile using odin from 2.3.3 gingerbread. now I want to go back to gingerbread. it doesnt have to be 2.3.3. any gingerbread is fine. can I downgrade it like when I updated to jelly bean with firmware from Sammy bile ? thanks. cos I confuse with the bootloader that people talk about. they say you cant downgrade from jb to gb cos that bootloader. please help me. thanks so much before

  23. This small bit of information, was a godsend and saved my bacon, I could not reset the 11 count I had on my SGS2 GTi9100. I Odin’d the boot loader above and used what I had thought was a dodgy Jig key, and Hey presto I can send my phone back for a guarantee fix at Samsung. Thank you once again for posting this simple yet effective fix, I’d been stressing all damned week after a bad Kies firmware update.

  24. hi.i need your s2 from custom rom 4.3..then flash to custom 4.4.2..after flash 4.4.2, my wifi still working, but after restart my phone, my wifi cant ON..i try to downgrade to official ICS, but still cant ON..i dont think and im not sure that my wifi chip is burned, because i only ON wifi about 7hours/day..hope u can help me..thanks


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