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If you or your customer still run 2018.4.1.x firmware, it now is really time to upgrade!
https://www.ibm.com/support/pages/supported-firmware-versions-and-recommended-levels-ibm-datapower-gateway-products
------------------------------Hermann Stamm-WilbrandtCompiler Level 3 support & Fixpack team leadIBM DataPower Gateways (⬚ᵈᵃᵗᵃ / ⣏⠆⡮⡆⢹⠁⡮⡆⡯⠂⢎⠆⡧⡇⣟⡃⡿⡃)https://stamm-wilbrandt.de/en/blog/------------------------------
Thank you for posting this Hermann, I will make a small blog about this to put more eyes on it, along with the other announcement!
can we jump straight to 10.5 from 2018.4.1.25
"Knowledge Collection: How to upgrade the firmware on an IBM WebSphere DataPower Gateway Appliance"
https://www.ibm.com/support/pages/knowledge-collection-how-upgrade-firmware-ibm-websphere-datapower-gateway-appliance