Best Garmin handheld devices not requiring firmware patching for unlocked .img maps?

I ended up getting a secondhand Monterra for a decent price. With a 64GB MicroSD card and a lot of maps. All maps work fine. GPS needed some Android and Garmin updates and works fine so far.

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The Android part is all outdated now. Android 4.0 and playstore does not work anymore but it is a lot faster then my old Oregon 450t and it has voice navigation for on the road, which is nice as well. (Oregon 450 just has bleeps)

Hyper Reviewed by Hyper on 15th June 2023. Best Garmin handheld devices not requiring firmware patching for unlocked .img maps? Appreciated features: larger hi-resolution screen, fast processor. I now use the older Garmin Oregon 450t for hiking and geocaching. It still works fine but it is fairly slow and the compass direction is not very good. I'm interested in buying a secondhand Garmin of a newer generation with a larger screen and faster hardware. I want to be able to use unlocked .img maps without having to patch my Garmin firmware. Which devices can you recommend? (Garmin Oregon/Montana/Monterra even?) Rating: 5