TP-Link TL-WR740N router firmware, with the name marking version 4.27, packed in a 3.26 MB RAR archive. The tag most likely refers to hardware revision 4 of this router, so compare it with the sticker on the device before use. A technician can load the image through the recovery method or flash the SPI chip directly when the router no longer boots. Back up the original flash content first, since it stores the wireless calibration data and MAC address, and make sure the dump size suits the chip.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @biosarchive. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →