[SIZE=+1]Indeed it does appear that VZW/Google have stopped providing the 1.17.605.1 -> 2.37.605.4 OTA update.[/SIZE]
Crap. Looks like I have some work to do.
I have a backup copy of that OTA
06cb731fe7f3.OTA_Desire_C_Verizon_WWE_2.37.605.4_1.17.605.1_release.zip
and can push that somewhere ... if someone can remind me what the correct key sequence is for getting past the (1.5) stock recovery splash screen. (The OTAs may be applied as an "update.zip" file in the root folder of the SD card). The 1.5 stock recovery was different from the later 2.1 stock recoveries in that a second press of "Vol-Up" after the recovery splash screen appears does not launch the recovery menu (in the 1.5 recovery). I recall that there was a different button combination, but I can not remember it (or figure it out experimentally, it appears).
For those of you "stuck" on factory 1.5, you will need to re-root and (temporarily) find a different return-to-stock-2.1-JulyOTA method. Either that, or, if your objective is to return your phone, I'll point out that 1.5 is also "factory software".
Stay tuned
bftb0