RTL8710BX with 2 MB flash on a T102-V1.1 cannot connect to Wi-Fi network

[spupetic]

I have generic Tuya smart sockets with a T102-V1.1 board, but it doesn't have the RTL8710BN, but the BX, without the 4 MB flash, according to ltchiptool, it has a 2 MB flash. I have installed ESPHome kickstart (RTL8710BN) on them, but I couldn't get Wi-Fi client mode working. I have tried different APs, changing channels and WPA mode, password, without success. Then, I have compiled ESPHome with the same and different (X-based) board, but it did not help. The fallback AP works though.