check the availability of the server in the description of the memory ui you use! If you don't get any answers, try to read carefully everything in the topics explaining how to use the hack for your particular game!
You can use it on all Garena servers, including Taiwan. Unfortunately, compared to other servers you will get banned a lot easier. Garena uses xigncode3, which is a very strong kernel anticheat. Hard to bypass it, especially for a public free cheat.