- The hashboard performes exactly as advertised: ECO mode (~125 watts 2TH/S), Turbo mode (~200 watts 3TH/s).
Their miner isn't efficient. You barely earn profit even with $0.05/kWh and i don't even consider other overhead (cost of this hardware, pool fee, tx fee, etc.).
Yes, it's not very efficient by today's standards. If my math checks out, in Eco mode it should have an efficiency of 62.5J/TH and in Turbo it's 66.67J/TH.
For example, an Antminer S19 Pro (110Th) is roughly twice as efficient, only requiring 29.5J/TH (since it pulls 3250W and achieves 110TH/s).
That's what I like about the Compac F: It uses an S17 chip. The S17 Pro sits at around 40J/TH and the Compac F, overclocked to 0.3TH/s at just below 15W, of course means a similar efficiency of ~45J/TH. Unfortunately since it's a single chip on a stick, you pay more 'overhead' (board, circuitry, packaging, shipping) than if it was a pod miner like the Apollo. I'm still eagerly waiting for a pod miner by sidehack..

- jstefanop recommends not to update the operating system (sudo apt update && sudo apt upgrade), because it may break stuff. This is pretty unacceptable to me, as the easiest way that hackers get into a network / system is looking for outdated packages and misconfigurations. It's definitely easier than looking for 0-days yourself!
- Using the built in system update function will brick your system DO NOT UPDATE USING THE SYSTEM UPDATE we will periodically post updated images that have the latest system updates
I wonder what their OS based on? I don't expect stuff break easily if it's based on conservative OS (such as Debian and Rocky Linux).
No need to wonder! It's Armbian. I will boot my 'stock microSD' later to check again what exact version it is and add it in the original post. I think it's even the latest LTS version, but just that all the packages are outdated. It's not about stuff breaking easily, but about keeping a system outdated.
Software gets hacked all the time, CVEs are released and patches are installed. Except on this device; where we're discouraged to upgrade the software and thus can't get the latest patches.