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Serial cable can be either USB or DB9 connection type and be capable of voltage level shift to +3.3V, not +5V. Some routers have serial ports inside the WAN port, and here is a link to some Serial port pinouts.
#Level shifting tty cp2102 debrick router install#
Unless it has an OEM header, you have to either solder the wires to the pads, or remove solder from the holes to install an appropriate header. Serial ports are normally four or five pins on the router board. The last resort is to desolder the flash chip and use a programmer to flash CFE (if needed) and firmware. Otherwise JTAG is required to debrick, if available, which can also replace a corrupted CFE. Routers with a serial port AND working CFE (bootloader) can often be recovered with a serial adapter, using CFE low-level commands.