AOS Release 6.4.6.R01 Release Notes November 2013
Downgrading From AOS 6.4.6.R01
Downgrading an OmnSwitch to an earlier AOS release consists of the following steps. The steps must be
performed in order. Observe the following prerequisites before performing the steps as described below:
• Downgrading to previous AOS releases from AOS release 6.4.6.R01 may require the FPGA/CPLD
or uboot/miniboot to be downgraded. Please refer to the version requirements table, previous
version release notes or the existing installed units for the proper versions.
• If an FPGA/CPLD downgrade is required, two reboots of the switch or stack being downgraded will
be required. The first reboot will happen automatically after downgrading the FPGA/CPLD. A
second reboot is required after downgrading the Uboot/Miniboot and AOS.
• Once the proper versions are confirmed, download the appropriate AOS images, Uboot/Miniboot,
and FPGA files from the Service & Support website.
Summary of Downgrade Steps
1. Downgrade the FPGA/CPLD, if required. (switch/stack automatically reboots)
2. Downgrade the Uboot/Miniboot (if required) and AOS images (Reboot required)
3. Verify the downgrade and remove the downgrade uboot/miniboot and CPLD files from the switch.
OmniSwitch 6850E/6855/9000E------ Release 6.4.6.R01 Page 61 of 80
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