Feeling bad about tl-wr842n v9.1, only 1M flash

nononoo
25Q80CS1G(8M-bit)

What's more, MT7628KN doesn't support external DRAM - it has 64 Mbit (8 MB) built-in DRAM memory.

1MB flash / 8MB RAM is way too little to run OpenWrt -> unsupportable
https://openwrt.org/supported_devices/432_warning