Connect to PRET PJL mode, enumerate device files, recover the latest journal receipt, follow the NVRAM reference, and read NVRAM to recover the flag.
CTF WRITEUPSHARDWARE
HTB - Cadence in the Cord
HackTheBoxEasy
Cadence in the Cord is a Sigrok/UART challenge where the apparent serial message only serves as a guide to a second, covert channel encoded in the inter-frame timing—short gaps as 0, long gaps as 1.