Most oppo devices use hard glue to protect the main chipset. The cheapest way to remove the old eMMC in Oppo devices is to use a mini grinding machine
Oppo R2001 preloader doesn't support Samsung eMMC, but don't worry using UFI Box it is easy to patch the CID into the other eMMC vendor as listed in the preloader file.
So we can still use Samsung eMMC to this phone.
In the following video we patch Samsung KMKJS000VM into SkHynix H9TP32A8JDBC, both eMMC share the same spec and the same DRAM config.
https://www.youtube.com/watch?v=stXUsLWyQIY