@ @rt
I assume that was for data retrieval.
The intention was to revive it, not so much as to use it, but rather to learn something new (a challenge to myself if you will). Unfortunately it wasn't a success story. Usually then such eMMC failure occurs, it can be "revived" with USB SD card reader, or if things are bad enough with PCI-E SD card reader (at least by the info I've found online). USB SD card stage was somewhat successful, but the tablet didn't work in the end. That can easily be my "top notch" BGA soldering skills though.
Decided to proceed to PCI-E stage. A PCI-E card reader was needed and there was one in my notebook, but it had few pins bent and wasn't working. Attempted to fix it, but construction of the reader was such that one had to destroy it to fix it. In an attempt to replace the reader, the motherboard died (it was on its last leg anyway).
The end result is a dead Samsung tablet (i.e. not fixed), a dead notebook and new (well a used one) notebook which I had to repair (corrupt BIOS) for which I had to make an SPI programmer and to debug an issue of BIOS not updating ("dirty" ME region problem).
Bottom line, one can never know/predict how things may develop and what one can end up learning.