KindleHF: Downgrade mtune to A9

[NiLuJe]

Turns out we can't have nice things because PW4 ;'(.

Might require a similar fix in the actual kindlehf TC.

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This change is 

[NiLuJe]

Re: koreader/koreader#12988

[Rexathion1]

Turns out we can't have nice things because PW4 ;'(.

Might require a similar fix in the actual kindlehf TC.

This change is 

Thanks for fixing this despite being busy rn
Is the issue specific to PW4? My KT4 has the same issue & error from koreader/koreader#12988

[Commodore64user]

we can't have nice things because PW4 ;'(.

As far as I am concerned, PW4 is the worst kindle ever made. yeah, worse than even the much older ones.

[NiLuJe]

Turns out we can't have nice things because PW4 ;'(.
Might require a similar fix in the actual kindlehf TC.
This change is 

Thanks for fixing this despite being busy rn Is the issue specific to PW4? My KT4 has the same issue & error from koreader/koreader#12988

Oh, yeah, makes sense, forgot that the KT4 also had support for 5.17.

Yep, likely running on a similar board/SoC.