OK, I don’t know too many advanced things about microcontrollers :(… I studied Attiny13’s datasheet and I was looking for some correspondent pins for high voltage programming, something as on doctor board: OE, RDY, BS1… but there where just SDI, SDO, SCI… and I did not know which goes to where. Well, in the meantime, I discovered that high voltage programming can be serial or parallel and some MCUs suport just one of them, like Attinny13 which works with HVSP. But what solved my problem was studying more closely your adapter schematics and only then I noticed the connection between those 2 pins (OE and XTAL1).
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