Hardware version: Ver 4.26 FCCID : TE7WR741ND V4 From Web UI: 3.16.5 Build 140704 Rel.62568n 硬體版本: WR740N v4 00000000 SoC: ATHEROS AR9331-AL3A P13U42.0K5 Wikidevi DRAM: ESMT M13S2561616A 256 Mbit (16Mb x 16 bit = 32 MB) DDR SDRAM Flash: S25FL032P 32 Mbit (4 MB) Flash memory Flash datasheet from date codes of components, this is manufactured around 2014~2015 OpenWRT link how to add the serial console, in case no Tx uboot mod