MA5600T - Firmware Upgrade - How To Upgrade an Old Version OLT?

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Hello fellow Network Engineers!

I currently have a customer that has a really old OLT, that has been fully operational for years and now they want to upgrade it. Although, its current version is really old. Like the following command shows:

OLT1-PNHE-CGO#display version{ <cr>|backplane<K>|frameid/slotid<S><Length 1-15> }:  Command:          display version  VERSION : MA5600V800R011C00  PATCH   : SPC100 SPH109 HP1109  PRODUCT : MA5680T  Active Mainboard Running Area Information:  --------------------------------------------------  Current Program Area : Area A  Current Data Area : Area A  Program Area A Version : MA5600V800R011C00  Program Area B Version : MA5600V800R011C00  Data Area A Version : MA5600V800R011C00  Data Area B Version : MA5600V800R011C00  --------------------------------------------------    OLT1-PNHE-CGO#display patch all  Software Version:MA5600V800R011C00  SPC100  SPH109  HP1109  ------------------------------------------------------------------------  Current Patch State:  ------------------------------------------------------------------------  Patch Name        Patch State     Delivery     Attribute     Dependency  ------------------------------------------------------------------------  SPC100            running         common       cold patch    NO  SPH109            running         common       hot patch     NO  HP1109            running         common       hot patch     NO  ------------------------------------------------------------------------  Total:3  Patches in the system cannot be rolled back

According to great Huawei documentation that I could find on the Enterprise website, the procedure for this firmware upgrade is the following:

But the patches and firmware versions indiced below are not available for download on the Enterprise website and that is the one we have access to.

In this case, the patch SPH111 and the firmware R012C00SPH108 would be needed to be ready to upgrade to the final version.

The only firmware versions that are available on the Enterprise website are the following:

How are we able to acquire the older firmware to perform the whole firmware upgrade procedure?

The complete Huawei documentation on OLT firmware upgrades is attached.

Thank you!

MA5600T Upgrade Method Description-20211112.xlsx

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