How do i update the Boot ROM mpb 12,1?

[DSLY]

I have a MacBook Pro '13/early2015 with Mojave on board (10.14.6)
boot rom version mbp121.0167.b24
How can I update the firmware and stay on Mojave?
I think I should clean the disk, install a clean system online, and then restore the data from the time machine?

 

[Audit13]

Firmware upgrades are installed during a macOS install.

Using the online system to reinstall the OS may reinstall Mojave so I recommend backing up wth Time Machine, upgrading to the latest OS from the current Mojave installation, reinstall Mojave, and restore from TM.

 

[DSLY]

Why do I need the latest version of Mac OS?

 

[Audit13]

Why do I need the latest version of Mac OS?

You don't have to do anything if Mojave is working fine. A bootrom upgrade may be required to run a more recent OS which is why the bootrom gets upgraded during the OS update process.

Running a more recent bootrom with an older OS is fine but running a newer OS on an older bootrom make cause issues.

 

[donawalt]

Have you checked out Silent Knight? It provides fully automatic checks of firmware and security systems. Great free tool (as are others there) --plus great articles. Supports Mojave n one of the versions..

SilentKnight, Skint, silnite, LockRattler, SystHist & Scrub

Skint – a watchful eye on security settings Updated! Checks key security settings and features including SIP, SSV, Gatekeeper, XProtect, XProtect Remediator and macOS security updates. Runs a…

eclecticlight.co