I'm currently running OS X Yosemite 10.10.5 on my MBP from mid 2010. And it's working, be it rather slow. I now run into the problem that certain software (e.g. Brave browser) is no longer supported and I need to update to at least OS X 10.11. But I'm wary of that because I'm afraid it will get even slower or stop working all together. And as far as I know it's not possible to downgrade again if that were to be the case. Could anyone tell me if my MBP would survive the update and what I can expect in terms of performance. Also if it is correct that downgrading is not possible. I know she's really old, but I don't have the cash to replace her just yet.
Specs:
Processor: 2.66GHz Intel Core 2 Duo
Memory: 4GB 1067MHz DDR3
Graphic card: NVIDIA GeForce 320M 256MB
Specs:
Processor: 2.66GHz Intel Core 2 Duo
Memory: 4GB 1067MHz DDR3
Graphic card: NVIDIA GeForce 320M 256MB