3081574 - After Front-End Server upgrade to S/4HANA 2020 Fiori Launchpad is appearing blank

• Upgraded Front End Server (FES) from 4.0 to FES 2020 (From old FES to newer FES)
• When launching the Fiori Launchpad, it is now appearing blank
• Browser console error claims that it is booting up with SAPUI5 1.52.20 (Loading older SAPUI5 version instead of the new expected version)
  
  ~~~Error~~~~
  
  GET https://sapui5.hana.ondemand.com/1.52.20/resources/sap/ushell_abap/bootstrap/evo/abap.js net:ERROR_ABORTED 404   FioriLaunchpad.html:12
  
  ~~End Error~~
  
  
• Running /UI5/UI5_UPLOAD_PATCH_TO_MIME shows error -> File contains no IDs
• Clearing the cache may work 1 to 2 times but will fail after the 3rd or 4th refresh
• Based on the SAPUI5 maintenance the FES 2020 should be at least version SAPUI5 1.84

SAP Fiori Front-End Server 2020 for S/4HANA

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