Safe upgrade path servers

Hi,
for both systems there is no model specific “multi step” jump path documented like on some older 12G/13G boxes; you mainly need to respect the general rules (iDRAC first, then BIOS, mind prerequisites, and avoid very old → very new in one jump if possible). 

General safe approach

- Update **iDRAC before BIOS** so Lifecycle Controller has the newer code when orchestrating BIOS and other firmware updates. 
- Check each target package’s “Important information” / “Installation instructions” on our driver page for your exact R6515/R6615; if a specific intermediate version or CPLD/NIC firmware is required, it will be called out there. 

- Prefer one **major version jump at a time** (e.g., if release notes say “minimum supported base X.Y.Z,” get to that, then go to current). When in doubt, stage through one mid 2023–2024 era BIOS instead of leaping from a 2020 build to 2026 in one go. 
- Do updates with **minimal load**, create backups before updating, and avoid “install on next reboot” for critical prod gear if you can schedule a maintenance window and watch POST. 

R6515 (BIOS 2.9.3, iDRAC 6.00.30.00)

- Go to Dell’s R6515 driver page, choose your OS (or “Not applicable”), and note the **latest iDRAC** and **BIOS** plus any “minimum recommended” code in the descriptions. 
- Safe pattern you can use:
  1. Update iDRAC from 6.00.30.00 to a mid train 6.x/7.x that is explicitly supported as a minimum in the latest R6515 BIOS notes (if listed), then to the current iDRAC. 
  2. Once iDRAC is current, update BIOS from 2.9.3 to any required “base” version named in release notes (e.g. a 2.x or 3.x that is required), then to the latest BIOS. 
- If no prerequisites are mentioned, you can usually go straight from 2.9.3 → latest, but I’d still avoid jumping several years in one shot on production: stage through one intermediate version from the same major family if available. 

R6615 (BIOS 1.9.5, iDRAC 7.10.70.00)

- R6615 is 16G, same iDRAC generation as R7615; Dell and OEM guides show current validated iDRAC/BIOS combinations like iDRAC 7.20.80.50 with BIOS 1.15.3 on similar platforms. 
- Recommended pattern:
  1. Bring iDRAC from 7.10.70.00 to our Dell list(see link below) as minimum/recommended for the latest R6615 BIOS, then, if needed, to the very latest 
  2. Then bring BIOS from 1.9.5 to the latest, inserting a single intermediate 1.x only if the release notes explicitly call for it. 

Practical execution tips

- Use iDRAC Web UI: Maintenance → System Update, upload the Windows .exe for BIOS/iDRAC images, schedule and apply, and monitor Job Queue until complete. 
- Do a **graceful reboot** after BIOS updates and verify POST, firmware inventory, and that OS/drivers are happy before moving to the next server. 

How to Update Firmware Remotely Using the iDRAC Webinterface
https://www.dell.com/support/kbdoc/en-us/000134013/dell-poweredge-update-the-firmware-of-single-system-components-remotely-using-the-idrac

PowerEdge: Minimum, Recommended, and Latest Code Versions 
https://www.dell.com/support/kbdoc/en-us/000227230/minimum-recommended-and-latest-code-versions-for-dell-technologies-poweredge