Thank you again. I have had a look at the pdf, but it is somehow confusing. I understand that since I am at 23R8, I can immediately upgrade to 35R3B1 with no apparent issues.
However, it is not clear whether I can then jump to 35R3B2->37R3->R6->R8->38R4, or whether the warnings for 37R3 (compatible with F hardware) or 37R6 (compatible with G hardware) are a show stopper and I'd rather stay with R3B2.
Sorry about being redundant, I am willing to update this unit but I would hate to brick it...
Any suggestions will be welcome.
PS: Just in case it helps, I decided to go ahead and try upgrading in steps, so I went through three or four of the pending upgrades, just in case I receive any hardware incompatibility warning, but it looks like everything went fine, now I am running 38R4 with no apparent issues.
Regards!