- Note: Welcome to try out it, You Agree to Proceed and Use at your own risk. **

• Releases

openwrt-ramips-mt7621-xiaomi_mi-router-4a-gigabit-v2-squashfs-sysupgrade.bin

By the way, the password is password

There are two types of firmware releases

1. CSW-LEDE-R22.10.1 Kernel 5.4.214 (use coolsnowwolf/lede R22.10.1)
2. Openwrt

Projects divided into several folders:

1. LEDE and several version of opwrt-22.03.2 or  22.03.05 or 23.05, (v23.05 officially support R4AGv2)

- Note: LED lights NOT working properly with 22.03.2 . (LED start working properly with/from Openwrt-v23.03.03 )

How to built/Compile Openwrt firmware(bin)?

If you want to learn about it, you can visit the followings:

• https://github.com/wbs306/Action_OpenWrt_Xiaomi_R4AG, Xiaomi R4A Gigabit Breed Flash (NOT for R4AGv2)
• https://github.com/wbs306/lede

Thanks to wbs306

• Many Thanks to wbs306's codes for Xiaomi R4AG V2 hardware changes! wbs306/lede@a2a3a4a

  1. target/linux/ramips/dts/mt7621_xiaomi_mi-router-4a-gigabit-v2.dts
  2. target/linux/ramips/image/mt7621.mk
  3. target/linux/ramips/mt7621/base-files/etc/board.d/02_network

• NOTE: from 23.03.3, you can fix LEDs, check hw2add folder

  1. target/linux/ramips/mt7621/base-files/etc/board.d/01_leds
  2. /include/kernel-defaults.mk

How to BREED flash Openwrt bin file?

Step#1 How to Telnet(talk) to R4AGv2 Router?

Successfully used @LordPinhead's code commit #99634522 to telnet XiaoMi R4A V2 Gigabit (RA4Gv2)

#Run the script
    pip3 install -r requirements.txt # Install requirements 
    python3 remote_command_execution_vulnerability_v2.py

Step#2 How to install bootloader "BREED" onto R4AGv2 router?

    1. Refer to this instrution https://www.right.com.cn/forum/thread-4007071-1-1.html
    (This instruction is just a reference, make your own judgements and adjustments to what you need)
    
    2. Go to https://breed.hackpascal.net, For RA4Gv2, download breed-mt7621-pbr-m1.bin 
    After successfully Telnet 192.168.31.1, use ftp app, copy it over to router's tmp folder.
    
    3. run the following script
    mtd -r write /tmp/breed-mt7621-pbr-m1.bin Bootloader

Step#3 How to Use BREED web to flash Openwrt Firmware(bin) onto R4AGv2 router?

1. Connect Ethernet Cable to LAN port rather than WAN port.
2. Hold & press reset, power on
3. Open browser, go to 192.168.1.1 for Breed Web Page
4. Flash these two bin files together at the same time! 
    - eeprom.bin
    - openwrt-ramips-mt7621-xiaomi_mi-router-4a-gigabit-v2-squashfs-sysupgrade.bin

1. Connect Ethernet Cable to LAN port rather than WAN port
2. PLEASE NOTE: router IP might be changed to 192.168.31.1
3. Default wifi SSID: WiFi_R4AGv2, Defulat wifi Key: password
4. If Router doesn't have DHCP enabled, you will need to manually assign IP to talk to your router:
For example:
    If router's IP is 192.168.N.2
    Manually assign your computer's ip to be: 
    192.168.N.88
    255.255.255.0

How to Fix Breed Endless reboot (infinite bootloop)

Breed doesn't officially support R4A that might cause endless reboot to 192.168.1.1

Telnet to Breed

• Chinese users can refer https://www.right.com.cn/forum/forum.php?mod=viewthread&tid=8298740&page=1&extra=#pid18865861

• Hold & press reset, power on, boot into Breed, then open cmd or terminal to telnet breed,

• Use command: telnet 192.168.1.1,

• Setup your local webserver, if your local machine address is 192.168.1.2 port:8080, place the sysupgrade bin at local webserver folder,

• Use command to copy bin over to router: wget http://192.168.1.2:8080/sysupgrade.bin

• 

• Check and Verify the bin file size, Length: 10749035/0xA4046b (10MB), Saving to address 0x80001000

• You MUST erase Enough Space for the bin file size from 0x180000 to 0xA80000.,Why 0xA80000? Big enought for 0xA4046b. Check yours!

• 0x180000 is set as the address where xiaomi would boot from in this case,

• 

• Use command: flash erase 0x180000 0xA80000

• 

• Use Command：flash write 0x180000 0x80001000 0xA80000

• (Write from 0x180000 address, use data previously wget(saved) at 0x80001000, given writing space with size of 0xA80000)

• 

• Use Command：boot flash 0x180000 (Boot from 0x180000)

Next Restart to breed Web interface

• You need to enable environment configuration:

• 

• Restart again to breed Web interface,then you can add autoboot.command，and value: boot flash 0x180000

• 

• This is to tell breed boot system from 0x180000.

If you want to flash New Openwrt Bin, you have to repeat above methods from..telnet and commands again.