![]() ![]() Now remove the jumper cable and try typing in uCon window.If the USB-to-TTL adapter is working, whatever you type should be echoed back (it should be visible to you). Here you can send data to the serial port. Now another uCon window shall open up.Choose the Com port as you found out in the step 3 above and click OK. Launch uCon and select Serial Backend.Download uCon software and install it on your Windows computer.It can be anything depending on the COM ports availability on your PC. In the Device Manager, expand Ports (COM & LPT) and check the port number assigned to your USB-to-TTL adapter.Press Win+R to open the Run dialog, type devmgmt.msc in it and press Enter.Use a jumper wire and connect the RXD pin to the TXD pin of your USB-to-TTL adapter and plug it in to one of the USB ports of your Windows PC.So here is a simple way to use the loopback test to find out whether your USB-to-TTL adapter is working fine or not. I thought it would be a good idea to first check if the USB-to-TTL adapter is faulty or not (yes on eBay, you never know). I bought a cheap USB-to-TTL adapter from eBay and tried to use it to resurrect my bricked router, but nothing happened. ![]() This type of interface is used by many electronic devices that have flash memory on the NAND or EMMC chips, e.g., routers, modems, hard disks, mobile phones and so on. The USB-to-TTL adapter basically provides a convenient way of connecting your PC to a device through the TTL serial interface. The only way to revive a bricked modem is either through the JTAG or through a simple USB-to-TTL adapter. It does not power on, it is not detected by the PC and the reset button does not work. Once the router is bricked, it becomes as dead as the doornail. Attempting to install DDWRT firmware on my TP-Link WiFi router, I finally managed to brick it. ![]()
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