Is there old version of openwrt firmware on Xiaomi Mi Router 4A (R4AC) 100M (International version)?

Installing and Using OpenWrt
1

New version firmware listed on wiki doesn't working for me, maybe old versions can work.

2

maybe - https://firmware-selector.openwrt.org/

3

https://downloads.openwrt.org/

Release Archive

4A is sensitive to firmware version, so please, check.