Hard to track. The upgrade itself is mostly software-related, plus adding a dual-channel wiring, ergo nothing a better informed technician could not do in field conditions.. Given the mess in Russia after the downfall of the Soviet Union I don’t find it surprising that there are no actual records about how many planes had this upgrade done but it is likely that all refurbished aircraft since 1991 have R-77 capability now.
Even Ukrainian Su-27s and MiG-29s were updated like this, I was told.
I realy doubt that they update to use a missile that was not even in their inventories. On some forums , RuAF forums decalred that they are using soviet era R-27 and R-73’s. No R-77 in their manuals.
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