Found this device and i wonder if OpenWRT could be installed.
Spec Summary
*No USB ports
Price as of this writing $45.75
What would need to be done in order to install OpenWRT on this piece?
A serial connection to start with 
Chances are pretty high, but you might need to send one to a developer with the necessary skill and interest to port it (although often it seems enough if you can provide serial output etc. and test images).
I ordered two, we'll see ...
If has a 8 pins SPI that is easy to replace by a 32 or 64 Mo flash
https://www.huasifei.com/a/Products/WIFI6%20MESH%20Router/2021/0327/121.html
Any update about the work?
MXIC MX30LF1G189C
NANYA NT5CB128M16P-D1
MT7905DAN
MT7975DN
MT7621AT
exist a footprint for a SPI Flash with 8 Pin's
web login admin
WIF SSID : AX1800-XXXX ( 4 last MAC values ) Key: 9876543210
serial port ok
anyone interested, if you want to add support in OpenWrt
you can probably copy the recent commit from x-wrt here for the nor version https://github.com/x-wrt/x-wrt/commit/78dcaaace06e727dc0e1e6dc1b00e57a923c9a96
and these two commits for nand version https://github.com/x-wrt/x-wrt/commit/2f64a5eebe4419c78855658daf3691bb858f1d2b#diff-fee4d4f8f139c8a1c0e4b335ecc47982b3546365353b524e3e9dcc32583b3302
https://github.com/x-wrt/x-wrt/commit/0109ce687c41abf3e97cb3a05d57281e9b3e8264#diff-fee4d4f8f139c8a1c0e4b335ecc47982b3546365353b524e3e9dcc32583b3302
does not do anything strange, adds device tree file and changes usual configs for ports and generating image.
Recovery is easy :
Serial adapter:
Tftp64 by Ph.Jounin
Computer 192.168.1.2
With serial port : key 2 , enter, enter, enter
file name in tftp64 folder: TB-WR1800K-MT7621-CPE-WR1800K-V1.0-202012052102-UploadBrush-bin.img
the file is original mtd4.bin save before and rename
:
If anybody is looking for the firmware(https://upgrade.wifi.sim.com/software) looks encrypted though
Same product:
Seems the same to this one I bought:
