I got my GEM45(firmware 210105) last week, also the actually same USB error in my rpi4b as you. But GEM45 could work well with my another SoC(Khadas VIM3). It seems to rpi4B hardware compatibility( especially power issue), not due to indi driver.

Although GEM45 is able to connect to INDI with GEM45 driver and slew mount, it shows the following error and crashes unexpectedly:
The ioptronv3 driver works well. May it be due to firmware issue?

I run mine through the Pegasus UPB powered USB hub but have also have the "Serial Read error a few times". Restarting the driver solved it for me but it is a little concerning.

We have been using a GEM45 in Raspberry Pi 4 for over half a year now with the mount directly plugged into the pi. No issues whatsoever! We were using Ubuntu Server 20.04 before and Ubuntu Mate 20.04 now. Both 64 bit.

Wouter

Thats interesting. I did find some info about the Rpi4 requiring an upgrade to the bootloader.
I am using Raspbian but I don't see why that should make a difference.

A different topic. My iPolar is not correctly oriented. If I want to move the dot on the screen up/down I have to use the AZ knobs and for left/right the dec.
Something is 90 degrees off but i am not sure if it is software or they have mounted the iPolar incorrectly in the mount?

iOptron releases new GEM45 now. Previous GEM45 separates iPolar & USB control into two cable, no usb hub. New GEM45 only has one USB line, which contain iPloar, mount control(FDTI USB serial), USB2.0 hub. I guess it will be something different, especially in power manager. More, new firmware(210105) may also make different communication. We are using Ubuntu 20.04 (aarch64) in SoC Khadas VIM3.

I have the new one, basically a GEM45G without the guider.
I will upgrade the firmware.

I have renamed the topic because it is not (to my knowledge) a driver issue, but rather likely an USB issue.

On the iOptron website (www.ioptron.com/Articles.asp?ID=318) I don't see the 210105 firmware you're referring to H.F.. Thanks for pointing it out though and I'll keep an eye out for that.

In the mean time I'm happy that the Bluetooth solution works fine. I can make a separate topic on how to make one yourself.

Rishigarrod, you could remove the iPolar with the two screws in the front and then loosen a grub-screw (stelschroefje) on the side, then rotate as you like and tighten again. Afterward of course, re-calibrate the iPolar.

Cheers!
Bart

@Bart. I am very interested how you put together the Bluetooth interface.
Does everyone polar align "weights down". I know this mount is a little strange when it comes to parking positions.

Ok, well since you live so close by, maybe we can meet and I'll show you how the Bluetooth device works. It's now essentially an iOptron iStarFi, but bluetooth.

I also polar align with the CW down. Somehow though, the mount doesn't go back to that position after polar aligning (with EKOS)
Somehow my iPolar didn't work with my laptop this time. Maybe a loose contact, I disconnected some connectors internally to figure out the schematic.

Tonight I achieved polar alignment error smaller than 30" within four iterations of polar aligning. That was without any prior alignment, just place the mount, eye-ball one of the edges of the saddle toward Polaris and go from there.
The first iterations, the alignment vector is completely out of the image, rendering it useless.
The error in Alt & Az though were reported and I could work from there, making me even more in favor of a live updated Alt & Az error.

Here is a meta-astrophoto of my setup at the moment:

Sounds like a good plan but I will have to wait until we are out of lockdown. My wife is in a high risk group so we are not taking any risks.
Tried to collect some date tonight but it was far too windy with my Edge 8HD. That's the disadvantage in living in the middle of a polder.

Looks like you also have an SCT on your mount. What are you using?

I can only get the iPolar to work if I plug into the mount. If I try to connect to the saddle it is not recognised.

The full name should be v20210105 in www.ioptron.com/Articles.asp?ID=318, but the download link is invalid. My GEM45 just comes with firmware(v20210105).

Hi, Rishigarrod, please let me know the difference if you upgrade to new firmware.

Something is not quite right with the USB on this mount. After multiple attempts I finally get it connected.
Sometime the Commander will connect and other times it won't. I also have to make multiple attempts to connect the iPolar to native Windows 10.

When I try to upgrade (at least when it will connect) I get:
Version of mainboard in the package:210105
Version of RA board in the package:210105
Version of Dec board in the package:210105
Connecting .... Connected.
Initializing .... Complete.
Upgrading .... Failed.

When it works its great but this USB stuff is a bit frustrating!