What is the correct way to update the firmware of IBM BladeCenter?

Question

System administration

Good day,
I have never worked with branded servers before, but here I had to.
There are: BladeCenter-E (Model 86773RG/Hardware Revision 3) and HS21 (Model: 8853G1G/Hardware Revision 7)
I tried to go to the IBM website, but there the devil will break his leg what needs to be downloaded and how to install it.
If someone tells me what to download so as not to screw up the basket and give a link from where, I will be very grateful.

Answer 1

Here a friend writes:
pyatilistnik.org/kak-sozdat-repozitoriy-obnovleniy...
pyatilistnik.org/kak-sozdat-disk-obnovleniya-drayv...
Then load all the blades from the created ISO-shnik in turn, and update.