The information to which you refer specifically refers to booloader 1.1., so if you have 1.2 you are OK. I would suggest that you let it be, as upgrading a bootloader has a small but real risk of bricking the unit. (technical term).
Some people like to upgrade the unit to V3.5 first, but I am never sure it it is necessary. The important thing, either way, is to re-initialize the unit after the upgrade, especially if coming from a prehistoric software version.
