Can't set FUSE as required

Marcin_Sz.

Hi,
I have T56 and just tried to flash MEGA328PB microcontroller, but failed miserably.
I was required to set:
Lock: 3F
High: D9
Low: FF
Ext: 07
But you can't set it with checkboxes.
Is there any option to manually set the hex values?
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2023-9-23 19:20

admin

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2023-9-24 08:01

and Lock byte is same .high bits is RES bits.

Marcin_Sz.

Thank you!
I thought the whole bitmask is important. So I understand RES bits are disregarded on programming and don't influence anything.
So I must had failed elsewhere :D