QUOTE (This Old Drone, page 3 Sidebar)
The upgrades listed below are intended to simulate the challenges of utilizing older technology in Shadowrun.
These two upgrades are listed in the Standard Upgrades section of those drones which have them. Now, I would like to remind you of the rules for Standard Upgrades:
QUOTE (Arsenal, page 107)
Standard Upgrades: In this entry you will find a list of vehicle modifications (p. 131) that the vehicle automatically comes equipped with at no extra cost. These standard upgrades use the same rules as given for vehicle modifications, but they don't count toward the vehicle's slot limit and the vehicle itself still counts as unmodified. Other restrictions, like the maximum amount of weapon mounts, still apply. Removing a standard upgrade does not provide additional modification slots. The changes to a vehicle's stats due to its standard upgrades are already calculated into its stats list.
QUOTE (Arsenal, page 129)
This takes the usual modification test and requires the tools mentioned in the modification description. However, the threshold is halved and there are no further materials required.
(emphasis mine)
Now the description of Obsolescent and Obsolete do not mention tools required, skill, or test (they would be up to the GM to determine), but the rules for modifications do say that those standard upgrades can be removed like any others, thereby restoring the drone's Device Rating to something much more respectable.
I have the mental image of someone buying a Predator drone, popping its "hood," removing a black box and tossing it aside, and that Predator's Device Rating jumps up from a 2 to a 5.
DISCLAIMER: What I posted above is absolutely correct and legal, per RAW. This only works because the writers of This Old Drone wrote Obsolescent/Obsolete as Standard Upgrades, and did not create a new category of vehicle trait (they came close in the sidebar) and simply left it as a vehicle's version of a Weakness. This brings back fond memories of fully submersible aircraft carriers and superfreighters.