Unable to boot after restoring nand

Discussion in 'Switch - Backup Loaders & Modchips' started by raphzthename, Nov 19, 2018.

  1. raphzthename
    OP

    raphzthename Advanced Member

    Newcomer
    3
    Jul 25, 2007
    United States
    For context:
    • 4.0 Switch nand backed up with Hekate
    • Updated OFW to 5.1
    • Nand restore to 4.0 backup with Hekate
    Both `boot0/boot1` and `rawnand` were restored and verified successfully.

    I am now unable to boot up normally, which I assume is because the OFW update to 5.1 burned one fuse and my original 4.0 nand backup had zero burned fuses. I think I understand that part and I've read that it's still possible to boot into hekate to bypass the fuse check and boot into stock firmware. I'm unable to do so.

    Steps:
    • Put switch into RCM mode
    • Boot into hekate
    • Select Reboot (Normal)
    • Screen remains black
    How can I boot back into OFW?
     
  2. jakkal

    jakkal GBAtemp Addict

    Member
    13
    Apr 27, 2018
    United States
    if you have more burnt fuses than what 4.0 requires then youre out of luck (if you dont have a 5.1 backup)
     
  3. Uumas

    Uumas GBAtemp Addict

    Member
    7
    Sep 17, 2016
    Finland
    When you boot into Hekate you don't select reboot, but Launch -> Stock.
     
    raphzthename likes this.
  4. raphzthename
    OP

    raphzthename Advanced Member

    Newcomer
    3
    Jul 25, 2007
    United States
    Thanks. What's required to be on the sd card if I just want to launch this way?
     
  5. Uumas

    Uumas GBAtemp Addict

    Member
    7
    Sep 17, 2016
    Finland
    Nothing else than hekate_ipl.ini in the bootloader folder. Add "[Stock]" before the brackets so that it looks something like this:
    [config]
    autoboot=0
    autoboot_list=0
    bootwait=5
    backlight=100


    [Stock]
    { }
    The yellow lines aren't required and there might be some other options, but just let them be.
     
    raphzthename likes this.
  6. raphzthename
    OP

    raphzthename Advanced Member

    Newcomer
    3
    Jul 25, 2007
    United States
    Awesome! Working great now.

    A couple of final questions:
    1. I flashed back to 4.1.0. Is it possible to upgrade to 5.1 or will the official update force 6.0?
    2. Since I have already upgraded from 4.1.0 to 5.1 before, will I burn another fuse upgrading again (assuming I can flash to 5.1)?
     
  7. Uumas

    Uumas GBAtemp Addict

    Member
    7
    Sep 17, 2016
    Finland
    1. Online update will update to 6.1, if you want 5.1 use ChoiDujorNX or a game cart with 5.1 on it.
    2. No. Every time you boot the console (without rcm) it checks how many fuses are burnt. If there's too many fuses burnt, it'll not boot and if too few, it'll just burn more until it matches the amount required by the firmware. Let's use 3.0.1 as an example: It requires four fuses to be burnt. If you for example just updated from 3.0.0, which requires 3, it'll burn one fuse. On the other hand, if you tried to downgrade from 4.x which burns four fuses, you can't boot 3.0.1 or lower anymore.
    TL;DR: Fuses don't get burned while updating, but when first booting a new firmware
     
    Mat37 and raphzthename like this.
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