USB TTL cable no longer working

[tllim]

Have you tried the UART pins on the EXP port? I guess everything is wired to same place, but maybe there is some issue with a a connector.

Better use EXP port for UART console cable. The Euler port UART pin has voltage shifter and Euler port do not.

According pinout there is possible to have 6 UARTS (I plan to test this once I have my PINE64 in hands together with modules based on MAX3232 chip from ebay).
https://drive.google.com/a/pine64.com/fi...sp=sharing

1 of UARTs is on PI bus. I'd try this.
pin6   - GND
pin8   - UART_TXD
pin10 - UART_RXD

But don't know what device file each UART will have.
Try check what device files are there containing "tty" under /dev .

Combine both Euler and Pi2 bus, the maximum available UART is 4.