hi i tampering with my rb951ui bootloader and wrongly erease bootloader ic before dump it and my routerboard cant turn on please someone help me and send a dump ic name is mxic mx25l512 please help

You can load backup loader, if you turn on the device, while holding the reset button.
Tampering with RouterBOOT is a very bad idea. Device will not be usable, there are several protections in place.