any updates, very hard to find out soc pinout 
switch SOC from NAND flash to SPI flash.
-- update --
Install uboot breed for easy recovery
Openwrt is now available for both 4A and 4Q both of which were released after R4. Can someone care to explain why not this device?
The stock firmware isn't avaliable in Xiaomi's website. The only thing you can do, for now, is install Padavan for Mi Router 3G, which works on Mi Router 4.
To enable writing to the console, you must reset to factory settings
Then you see uboot boot, press the keyboard 4 button (enter uboot command line)
Please choose the operation:
1: Load system code to SDRAM via TFTP.
2: Load system code then write to Flash via TFTP.
3: Boot system code via Flash (default).
4: Entr boot command line interface.
7: Load Boot Loader code then write to Flash via Serial.
9: Load Boot Loader code then write to Flash via TFTP.
If it is not successful, repeat the above operation of restoring the factory settings.
After entering the uboot command line, type:
setenv uart_en 1
saveenv
boot
Serial port (UART) will work
windows ：
Create a simple http server with caddy（ V1.0 ）
like E:/working
.\caddy.exe -port 80 -root E:\working
then
cd /tmp
wget http://you computer ip:80/openwrt-ramips-mt7621-xiaomi_mir4-squashfs-kernel1.bin
wget http://you computer ip:80/openwrt-ramips-mt7621-xiaomi_mir4-squashfs-rootfs0.bin
mtd write openwrt-ramips-mt7621-xiaomi_mir4-squashfs-kernel1.bin kernel1
mtd write openwrt-ramips-mt7621-xiaomi_mir4-squashfs-rootfs0.bin rootfs0
nvram set flag_try_sys1_failed=1
nvram commit
reboot
scp openwrt-ramips-mt7621-xiaomi_mir4-squashfs-sysupgrade.bin root@192.168.1.1:/root/
using ssh connect mir4
sysupgrade openwrt-ramips-mt7621-xiaomi_mir4-squashfs-sysupgrade.bin
reboot
it's done
check md5sum !!! check md5sum !!! check md5sum !!!
md5sum
fea0fc7382fc1c4e25255319ab42bf7c openwrt-ramips-mt7621-xiaomi_mir4-initramfs-kernel.bin
70c322e7627570cc1a31cf4e16a352cb openwrt-ramips-mt7621-xiaomi_mir4-squashfs-kernel1.bin
97c574488be2718b65ee140947c0b608 openwrt-ramips-mt7621-xiaomi_mir4-squashfs-rootfs0.bin
6b68c59617a9ecb39f3c0638ef6ee89e openwrt-ramips-mt7621-xiaomi_mir4-squashfs-sysupgrade.bin
files
caddy V1.0.4
https://github.com/caddyserver/caddy/releases/download/v1.0.4/caddy_v1.0.4_windows_amd64.zip
image openwrt 19.07.2
https://github.com/ioiotor/mir4-autobuild/releases/download/v0.1/openwrt-ramips-mt7621-xiaomi_mir4-initramfs-kernel.bin
https://github.com/ioiotor/mir4-autobuild/releases/download/v0.1/openwrt-ramips-mt7621-xiaomi_mir4-squashfs-kernel1.bin
https://github.com/ioiotor/mir4-autobuild/releases/download/v0.1/openwrt-ramips-mt7621-xiaomi_mir4-squashfs-rootfs0.bin
https://github.com/ioiotor/mir4-autobuild/releases/download/v0.1/openwrt-ramips-mt7621-xiaomi_mir4-squashfs-sysupgrade.bin
Hi All.
So what is the current status of support for 4 (not 4a/c or anything else. Just number 4)...
And if I have access to the router, using the Invasion exploit, what is the next step?
Upload an image (which image?) and use mtd (with what options??)
Thank you All
see my previous post
This one?
Hi @ioiot, i`m flashed openwrt with https://github.com/acecilia/OpenWRTInvasion method , however using firmware files from your repo:
openwrt-ramips-mt7621-xiaomi_mir4-squashfs-kernel1.bin
openwrt-ramips-mt7621-xiaomi_mir4-squashfs-rootfs0.bin
openwrt-ramips-mt7621-xiaomi_mir4-squashfs-sysupgrade.bin
All seems to work fine untill i try to setup openvpn ... i`ve got :
ERROR: Cannot open TUN/TAP dev /dev/net/tun: No such device (errno=19)
looks like it cannot load kmod-tun module although should be compatible with the kernel version ... :
root@mi4-home-pchelina:/dev/net# uname -r
4.14.171
root@mi4-home-pchelina:/dev/net# lsmod | grep tun
tun 24106 -1 [permanent]
root@mi4-home-pchelina:/dev/net# opkg list-installed | grep tun
kcptun-client - 20200409-1
kmod-tun - 4.14.171-1
root@mi4-home-pchelina:/dev/net# opkg files kmod-tun
Package kmod-tun (4.14.171-1) is installed on root and has the following files:
/etc/modules.d/30-tun
/lib/modules/4.14.171/tun.ko
Do you have any suggestion on this ? perhaps i`m missing something.
Thanks in advance!
Hi @ioiot
Do you plan to release 19.07.4 for R4?
Also found PR for merging R4 support into master: https://github.com/openwrt/openwrt/pull/3330
Can you please help on how to unbrick this device by having TFTP access? I can upload files using the same r4a instructions from Xiaomi Mi Router 4A Gigabit Edition (R4AG/R4A Gigabit) -- fully supported and flashable with OpenWRTInvasion
Can you please indicate which bin file to tftp?
I bricked it by updating to openwrt for r4a
I've tried TFTP flashing this Bootloader.bin and many others bin files for the device and with all of them I get a blincking red light.
Did you manage to unbrick it?
Thank you for your patience
1 Like
Support added to master. Snapshots available in https://downloads.openwrt.org/snapshots/targets/ramips/mt7621/
1 Like
This topic was intended for adding support for this specific device.
Since official snapshot images are available now, I will set a timer for this topic to close.
Therefore: Please open new topics for any open issues with this device.
Thanks!
This topic was automatically closed 10 days after the last reply. New replies are no longer allowed.