A few months ago I upgraded the firmware on my EAP225 V3 to 5.0.5 Build 20210618 (Canadian).

Before the upgrade things had been stable and honestly I don't remember why I even upgraded. Since the upgrade I've had 2 issues. The first was the EAP failed to completely recover from a power outage, and then today I tried adding a second SSID to the 2.4 radio and experience a similar issue to the power outage one.
What happened in both cases is that the EAP dropped a number of wireless clients, I did a reboot of the AP, after the reboot the web interface was unreachable, but I could ping the AP.

Disconnecting the network cable to the AP to power cycle it did not resolve the issue. The only resolution was to pull the AP from it's ceiling mount and then reset it using the reset button.

I thought that maybe this was a known issue and that a newer firmware might address the problem. I read the release notes 

for 5.0.7+ but I didn't see anything specific for this issue. I decided to install the latest which is 5.1.7, however I got a 'bad file' response. A quick search and it's likely because I'm in Canada and tried to install the US firmware. I hopped onto the Canadian site to grab the Canadian version of 5.1.7 and the most current firmware available is 5.0.8. Not only is this firmware from 2022 it comes with a warning "Follow IC certification in Canada, can't downgrade to US/EU version any more if upgrade this firmware". 

So if I install this firmware I'll be locked to this ancient code with *new* features like "Add support for Facebook Wi-Fi V2 in Controller mode" which hasn't been a thing for 2 years now.

How do I get my 225 onto the US firmware stream? Do I need to downgrade to a specific version of the Canadian firmware?