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GOP lower than 10 FBE200 H.265

Hi, is there a way to config GOP lower than 10 (like 1), this is my issue
with firestick (any nmodel) stream stuck in the last GOP image, settings

Input: 720p60

Output testing:
720p@30fps, GOP 30, i got 1 image every 1 second
720p@30fps, GOP 60, i got 1 image every 2 second
720p@30fps, GOP 180, i got 1 image every 3 second
720p@30fps, GOP 10, i got 1 image every 1/3 of a second

720p@60fps, GOP 30, i got 1 image every 1/2 second
720p@60fps, GOP 60, i got 1 image every 1 second
720p@60fps, GOP 180, i got 1 image every 1 1/2 second
720p@60fps, GOP 10, i got 1 image every 1/6 of a second

i have to say that this issue only happen with amazon firestick, any other androidTV device works as should be (Google certefied or not)

Thank you