Performed the 350MHz hardware mod / 500MHz license on my 4024A and now have a 500MHz bandwidth scope. Rise times are in the 570 to 580ps range. Stock rise times were ~1.30ns.
Some changes to the BOM originally posted by TheSteve:
https://www.eevblog.com/forum/testgear/dsox2000-and-3000-series-licence-have-anyone-tried-to-hack-that-scope/msg993078/#msg993078Capacitors:
C1 - 2.2 pF 0603, 100V NPO, Murata # GQM1885C2A2R2BB01D, Digikey # 490-4838-1-ND, quantity 4 -> Marked obsolete, replacement 490-13316-1-ND
C2 - 2 pF 0603, 100V NPO, Murata # GQM1885C2A2R0BB01D, Digikey # 490-6092-1-ND, quantity 4 -> Marked obsolete, replacement 490-8124-1-ND
Inductors:
I wanted to use the Murata parts, as they were available from Digikey and cheaper. 27nH Inductor is out of stock seemingly, so had to order that from Coilcraft directly.
L1,L2,L3 - 15nH 0603 2%, Coilcraft 0603CS-15NXGEU, quantity 12 -> Murata Equivalent, 490-15800-1-ND
L4 - 27nH 0603 2%, Coilcraft 0603CS-27NXGEU, quantity 4 (ordered direct from Coilcraft) -> Murata Equivalent, 490-15814-1-ND
Resistors: No changes
Under the shielding can the 4000 AFE looks somewhat different to the 3000 photos which gave some concern but turned out alright.