# Upgrading and Downgrading the Firmware on IR/IT Controllers (VMware)

Due to some issues with VMware ESXi 5.5, VMware ESXi 6.0, and VMware ESXi 6.5, you cannot upgrade or downgrade IR/IT firmware through LSA following the usual firmware flashing procedure. You must follow this suggested workaround:

1. Edit the /etc/sfcb/sfcb.cfg file.
2. Add the httpMaxContentLength: 4194304 parameter.
3. Restart the LSA service:

   /etc/init.d/sfcbd-watchdog restart

4. Flash the firmware.

Parent topic: Managing LSA on the VMware ESXi Operating Systems