Am interested in this as well, I tried to load my m3u file via memory stick but had the same as you and I only had 1/3 of the amount of channels [emoji848][emoji848]
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I bought a new 4K Firestick and uploaded Perfect Player + IPVanish onto it with no problems. Been using them on my early Firestick and would recommend them.
Not sure about using vpn on someone else stick tho?