Hey man, first of all, thanks for you work! I got into these things a while ago. Ordered one, and saw that they are closed source, which was a bummer. I was like: Isn't there a way to make these open source again? So I went on Google and got here. Decided to order some wires, a JTAG pin block, a CP2104 and here we are. Last weekend I finally made the attempt to solder the JTAG block on. Seems easy, but I think I had my soldering iron a bit to cold, because I needed a few attempts at it in order for it to work. The solders seemed nice, but somehow I didn't get a connection via the CP2104. Tried a different CP2104, and that also did not work, until I finally got some results while reading the device, but the characters were not readable. So I got my multimeter out, and checked my connections, only to find out the solder for the GND was not great. It made contact, but not great. So, bumped up the temps on the soldering iron and went over everything again, and then it finally worked 
It was kinda rewarding to see the logfiles scroll through my debugger screen. It's also pretty responsive. Quite surprised! So, now with the connection fixed, I went and flash the stable release with the configuration using bitaxetool. And it worked. Did some testing. Let it mine for a bit. Checked the temps, everything was fine.
Then I saw that there is a new version on Github, which is: v2.6.6b1-1.0.6. Flashed that, and that also seemed to work. The only problem was, that the temps went up on the ASIC pretty fast. That is when I saw that the fanspeed was pretty low. Around 900 to 1000 RPM on automatic. And it does not ramp up when the temps increase. So i quickly set the fanspeed manually to 80% and that is fine. ASIC temps are now around 59 degrees celcius.
Is this a known issue with this version?
I got to say, I removed the original fans, and put on a 3D printed fan shroud, to fit a 140mm fan on the back of the case (To have airflow to the PSU too). But that worked well with the other firmware. So it seems like it's an issue with version v2.6.6b1-1.0.6 for me. For now I will keep the fan speed on manual @ 80%. But it would be nice if I could use the automatic fan control again.
Oh i also removed the heatsinks, and removed the stock thermal paste. Put on ThermalGrizzly Kryonaut. That didn't lower the temps much, maybe 1 degrees celcius, if anyone was wondering. But I think it will be better for the long run, because the stock thermal paste is kinda meh. Also put some thermal pads on those silver blocks for the voltage regulator I guess? Those didn't make any contact with the stock heatsink. I don't know how those are called
Anyway, thanks for everything! Feels good to have this thing open source again.
It was kinda rewarding to see the logfiles scroll through my debugger screen. It's also pretty responsive. Quite surprised! So, now with the connection fixed, I went and flash the stable release with the configuration using bitaxetool. And it worked. Did some testing. Let it mine for a bit. Checked the temps, everything was fine. Then I saw that there is a new version on Github, which is: v2.6.6b1-1.0.6. Flashed that, and that also seemed to work. The only problem was, that the temps went up on the ASIC pretty fast. That is when I saw that the fanspeed was pretty low. Around 900 to 1000 RPM on automatic. And it does not ramp up when the temps increase. So i quickly set the fanspeed manually to 80% and that is fine. ASIC temps are now around 59 degrees celcius.
Is this a known issue with this version?
I got to say, I removed the original fans, and put on a 3D printed fan shroud, to fit a 140mm fan on the back of the case (To have airflow to the PSU too). But that worked well with the other firmware. So it seems like it's an issue with version v2.6.6b1-1.0.6 for me. For now I will keep the fan speed on manual @ 80%. But it would be nice if I could use the automatic fan control again.
Oh i also removed the heatsinks, and removed the stock thermal paste. Put on ThermalGrizzly Kryonaut. That didn't lower the temps much, maybe 1 degrees celcius, if anyone was wondering. But I think it will be better for the long run, because the stock thermal paste is kinda meh. Also put some thermal pads on those silver blocks for the voltage regulator I guess? Those didn't make any contact with the stock heatsink. I don't know how those are called
Anyway, thanks for everything! Feels good to have this thing open source again.