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Hello all, I've read most of the posts in this topic and see that noone has encountered any problems with TTL interface. My issue is: I soldered 3 pins to the contacts shown in the picture (see title). No mods or special prefs used. 115200 8N1 as standard on all devices used before. Connected CP2102 UART/TTL interface. Result - the interface either gave me nothing or gibberish ASCII symbols with PC speaker crackling crazy. Remedies tried: 1) Tested the CP2102 with already known to work devices (routers mainly). Result - all tried devices display readable text with no gibberish stuff. Conclusion - interface is working properly. 2) Resoldered wires instead of pins (the pins were a bit soft and thin, presuming a bad contact) and added some thicker pins to the ends. Also, used nearest screw hole as GND. Result - even more gibberish with sounding PC speaker at often times. 3) Switched thew wire connections on the RX/TX pins. Result - output stops, nothing shows up. Conclusion - the pins were connected correctly. 4) Joggled the wires and pins while connected (old experience, usually helped to determine RX/TX faulty or mixed connection). Result - the PC speaker doesn't beep anymore but the gibberish didn't stop. It even pulses untouched. Conclusion - applied remedy doesn't affect anything. At this point I've given up and re-read a lot of posts again.. maybe I missed something. Or, maybe there is a way to turn the interface ON/OFF in device preferences (not necessarily Settings). The device came with RZX.V01.20241108.1455 firmware on it. I tried ADB over network (since I don't yet own a USB-A to USB-A v3.0 cable). ADB enters SHELL as root already and I had to check the parameters in build.prop to make sure it dev release (which it is). Strange, I thought, but it's OK. I've managed to make a backup (all images except user data) with ADBDumper. I've made a USB-A to USB-A v2.0 cable figuring it could work but the device is not detected on connection and abandoned that. Any help or constructive advice would be much appreciated. Also, maybe someone mapped the TTL pins to somwere else and a more "comfortable" connection can be made. Thanks P.S. I am no newbie to soldering or SERIAL/TTL connected and programmed devices. Understandably sometimes there are nuances and other times I might miss things. No issue with that.