Because you did not read it well enough. Especially the first bullet.
The backup RouterBOOT version can not be older than v3.24 version. A special package is provided to upgrade the backup RouterBOOT (DANGEROUS). Newer devices will have this new backup loader already installed at the factory. Download the package for:
MIPSBE platform here SMIPS platform here MMIPS platform here TILE platform here.
I still dont understand, i have version 6.41.4 so it is newest.
Also protected router board enables, it is enabled, only max hold is not supported.
what should i do exactly?
i even tried to install this package, installed, ok, but still - protected routerboard function as it should, but hold max button is not supported.
YOU MUST UPGRADE FACTORY BIOS (factory-firmware) version to use protected RouterBOOT functions!!!
You know the differencies between Software (RouterOS) and BIOS (Firmware / RouterBOOT)?
You have 3.22 factory firmware and must be updated to correctly use protected RouterBOOT (RouterBOOT is not RouterOS)
Follow my guide, is not perfect because I do not know english, but if you READ ALL is useful:
viewtopic.php?f=2&t=94303&start=50#p580430
model RB951G-2HnD, mipsbe, firmware-type ar9344, the factory RouterBOOT is upgradable to 3.41? YES
model: CCR1009-8G-1S-1S+, tile, firmware-type: tilegx, the factory RouterBOOT is upgradable to 3.41? YES