To go back to Stock Recovery, you need to flash .tar or .md5 file of your Samsung device stock recovery using ODIN. If you can't find stock recovery to be flash, your alternative is to flash stock ROM using ODIN.
See here for help: How to Flash Samsung Android Devices: Stock Firmware Tutorial - ArykTECH

how to erase android phone data that can't be recovered

You can do a complete wipe from the recovery. go to the wipe menu and click on advance options, there you'll find various options to do so.

Normal Wipe will erase everything
 

A normal wipe from recovery will basically erase everything and data cannot be recoverable.
If you have a custom recovery then you can erase all the partitions and in case of a stock recovery you can only erase the data partition, cache partition.

To do that your mobile should be rooted this is the only way to change the boot screen.
After rooting your smartphone there are many apps who provides best boot screen logos .

How to write mac address .. tell me

reply
 

nice topic brother keep it up i'm new here

ROM stands for read only memory and a custom ROM replaces your device's Android operating system normally stored in read-only memory with a new version of the Android operating system

X-tigi v21 da file
 

hello guys is any body here have the Custom DA file for x-tigi v21? pls i need you help

need a rom
 

hello guys I need help hope im in right place ineed a rom for a rca tablet
rca maven pro never done this before can some please point me in the right direction thanks

hepl me to heplme huawei g620s

Any more details on how to flash ROM and stock ROM? [3]

Debugging here let me know

"Flashing a custom ROM" essentially means to load a different version of the Android OS. This site actually teaches it very well. A custom ROM is the full Android OS customized by the ROM builder usually to perform it faster, provide excellent battery-life or add new features.

zegaapparel
 

good post i highly appreciate