You need to get a dumb brick for that Rock 5B. Looks like you got one of the one...

death_syn on June 15, 2023 | parent | context | favorite | on: Unihiker, an $80 single-board PC with 2.8“ touchsc...

You need to get a dumb brick for that Rock 5B. Looks like you got one of the ones with a bad firmware. When it negotiates the power drops out. There're tons of forum posts.

Rediscover on June 16, 2023 [–]

You are correct. I have many that do 5V 4A.