Sorry to necro, but it might be of interest:
I managed to get at least a warranty status for these drives ...
Got the Serial from smartctl -a and used product code 736936-B21 on this page:
Select a product - HPE Support Center
This is from one of my older drives, so not to worry for this thread's deal P3700's
Unfortunately no updated firmware there ...
"Downloads for this product are not available through this website.
For
Enterprise products you may find US-English downloads at the
HPE Software Depot.
If you need additional help, you can contact your local HP representative for information on the specific update methods available for this product."
Will try to get my hands on a SPP CD...
Not sure how HP(E) handles support requests for in Warranty Items without Service contract ...
Edit: Some further generic details for performing further searches:
Product Number : 736936-B21
Description : HPE 400GB NVME X4 LANES WRITE INTENSIVE SFF (2.5IN) SCN 3YR WTY SSD
Part Number: 765059-001
Description: 400GB NVMe Solid State Drive (SSD) - Non-Volatile Memory express (NVMe) interface, Write Intensive (WI), 2.5-inch small form factor (SFF), mainstream endurance (ME), Smart Carrier 2 (SC2), power loss protection (PLP) - Supports select Gen9 servers