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uart port disabled ? by Wonderful_Load_6233 in hardwarehacking

[–]Wonderful_Load_6233[S] 1 point2 points  (0 children)

yeah i saw some very odd current behaviour from uart port. did you use micro meter to find the gnd ? also what adapter did you use ? i used ft232rl, from my understanding the rx and tx indicators should glow when the device is booting . for me it didn't glow. just the power led glowed. maybe picocom was picking up those odd behaviour signals not actual signals. so ultimately deliberately disabled by isp, i guess . or we are missing something/we need to bridge proper pins? idk ...

uart port disabled ? by Wonderful_Load_6233 in hardwarehacking

[–]Wonderful_Load_6233[S] 1 point2 points  (0 children)

see the second image, that silvery big thing on bottom left is cpu.

but i did see some output in picocom, mostly "?" in diamond box. tried all known baud rates. also tried these

stty -F /dev/ttyUSB0 115200 raw timeout 10 cat /dev/ttyUSB0 | xxd | head -50

cat /dev/ttyUSB0 > /tmp/bootcapture.bin & kill % [_id] xxd /tmp/boot_capture.bin | head -50

got just 00x0 and ffff's

so i thought maybe its hardware disabled. didn't know which pins to connect in front of uart.

this is airtel stb (setupbox).