Generally speaking, modern computers from nearly all manufacturers have quality BIOS chipsets and well-vetted BIOS code.
Flashing the BIOS always compels one to write out a backup of the current installed BIOS version to disk
before an "upgrade".
That way, if there is a mishap, one can simply restore the current BIOS code from an external backup.
I have not read of a 'bricked' Mobo in many decades; Routers, yes; but Mobos, no, as they are manufactured to be fool proof.
Most modern BIOS chips actually keep a copy of the current BIOS code in a hidden backup partition within the BIOS chipset.
But it is prudent to
first write out a backup of the current installed BIOS version to disk before an "upgrade" flash is attempted.
In the past we had to do this from a DOS boot working with diskettes to launch BIOS "Flash" software; it is all in the BIOS now.
Dell is quite reliable with their choice of hardware manufacturers and BIOS code sources, so after a bachup, I would upgrade.
It is true that one may not always need to upgrade to 'each' available new numeric version of a Mobo BIOS; but if Dell recommends a specific BIOS version, saying it will be last version to be made available for your specific Mobo, I would install it.
It is important to look at the silk-screened info on the Mobo to be certain of its Model / Part number and Revision number, then check on Dells website to verify the info you were given by tech support.
Then one can double check which BIOS version is actually needed for the specific Mobo and CPU that you have installed, as well as any troubleshooting or performance fixes that a newer BIOS version reportedly provides.
After all is double checked, do the BIOS backup and flash, as explained in the computer manual PDF from Dells website (there may be more than (1) manual pertaining to the computer model); the industry trend is to have a separate manual for the BIOS.
As to GMAX, I never used it; if you thought it was relatively easy, wait until you use Sketchup: IMHO,you'll never go back.
There are few hard core old timers who are familiar with GMAX and the whereabouts of documentation and tutorials.
One good source of GMAX info is likely to be Tom Gibson of CalClassics

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OOPS ...sorry about the "Old Timer", Tom>.
I hope this info helps a bit more.
GaryGB