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
Bumping since nothing changes for Ver:9.2 either: MT7628KN, 25Q80CSIG.
Please update the table accordingly https://openwrt.org/toh/tp-link/tl-wr842nd#unsupported_tl-wr842n_chinese-only_version