Problem with FOcus 40

Hi,
the subject says it already. Since iOS 15.2 introduced an annoying issue where the braille display randomly disconnects and cannot be repaired until your restart the device, I'd give you advice to restart your iDevice and then try to re-pair your braille display again. Before you do the restart, make sure you have ignored your braille display in order to manually pair it again.
Here's how it works:
1. Open settings
2. Go to Accessibility > VoiceOver > Braille and locate your braille display
3. Swipe down with one finger and double-tap
4. Locate the "ignore" button and double-tap it, then confirm the action by double-tapping the "ignore" button again (It could also be called "Ok" instead of "Ignore")
Now, you can restart your device.
Let me know if that helps.

I had the same problem last year when I got a new phone. While you have removed the Focus 40 from the apple devices, the ipad, and iphone have not been removed from the Focus 40 itself. This is why it is not pairing. So what you need to do to remove the devices is: Turn the Focus 40 on and press dots 1, 3, 5, 6, and space. Use the panning buttons to scroll to devices. Press one of the curser keys to open the device list and then scroll down untill you see a buttun that says delete all. This should delete all devices. Press the power button, and try pairing the Focus 40.

I had this problem with a Focus and iOS recently. If you have a5th Gen display check if it has the latest firmware. The latest is 5.82. Mine had an older version. This update seems to have been released rather quietly or else I am just not well connected to announcements. Anyways one of the release notes mentions changing Bluetooth pairing functionality, and this indeed cured my problem. Here is the link to download the firmware if you need it:
https://support.freedomscientific.com/Downloads/Focus/Focus5Downloads

4th gen here too. I think the menu relates the all the new functionality the newer Focuses have, like being able to pair to more than one bluetooth device, so the 4th gen does not have it. The only menu you can get into on the 4th gen displays is some kind of diagnostic menu by pressing space with 1 3 7 and 8. You can press space with 4 5 or 1 2 to move forward and back through the menu, but I don't remember what all the symbols in there mean.

I haven't had any huge issues with mine, although I'm sure they're there. I've noticed sometimes the display gets stuck in the middle of a line and words don't wrap. But I haven't played with it a lot yet. Here's hoping 15.3 fixes some of this stuff.

Yes that's right fourth gen latest firmware is v5.71. I am afraid there really isn't much to do. As crazy as it sounds I've had occasional success in the past by moving the display and phone further away from each other, e.g., carrying the phone into the next room with the display in pairing mode. I also suggest turning off all other Bluetooth devices the phone is paired too or tempted to pair too that is possible to do to try to get it to focus.

I can't duplicate this because I do not have a Focus 4th generation. If it is worth the inconvenience, I would suggest resetting nnetwork settings and see if this helps. I'm becoming concerned that this may be a wider problem with the older Focus displays on iOS.