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2 Attachment(s)
I found this in the BLHeli documentation - the left hand picture looks like a match for the picture Ocracoke posted earlier in the thread. This is the same ESC by the looks of it, just the 45A version.
Attachment 7945
Following that trail I then found this for the underside of the 65A variant, for those not brave enough to take one apart:
Attachment 7946
Conclusion: it's SiLabs MCU based, and ultimately that means no use of the existing TZ85A Brushless firmware or SimonK, both of which are only Atmel AVR MCU compatible