How to Downgrade Firmware

Enter Factory Mode on Latest Firmware

MCU1 Tegra Model S X

Downgrade Firmware to 2022.8.10.5

I have MCU1 update file and files for AP1, AP2, AP2.5.

Also I have handshake server with signatures for MCU1 firmwares.

What I Need to Downgrade Firmware?

1. Laptop with Windows 10 or 11

2. Buy Fakra LAN cable on eBay or Amazon

After Downgrading to 2022.8.10.5 FW

You can again:

• Enter factory mode again
• Use Toolbox 2.1 offline
• I can make root with activate fastcharge and block FW update

Long Press for Service Mode

Enter password service

Connect diag cable

Turn on Windows Subsystem for Linux

Download Ubuntu 18 from Windows Store

Download and install Toolbox Proxy

Login Toolbox 3 online

Copy Oden token to test.json file

Run port unlocking program

Turn on ignition on vehicle

Connect vehicle to WiFi

Open Ubuntu 18

Nc 192.168.90.100 25956

Use my handshake server IP address (100$ and I will show you IP address)

Download HFS File Server

Set 192.168.90.125 IP HFS File Server

Open HFS File Server FW update file

Download my FW update file 2022.8.10.5 (100$ file on my Mega)

Copy paste install command with Ubuntu

Wait until green line will be gone

Wait and press Software update

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