Thanks to this great community here, some anonymous contributor has published a way how to update the JBL Charge 2 on your own. The necessary firmware file was already posted by someone else some time ago, but so far there was no way how to perform the update without the right software. As many still seem to fight with JBL-support who is taking their customers for fools claiming that there is no firmware update available for the JBL Charge 2 I think we have to thank our unknown hero for posting this. He provided an archive including the 1.4.1 firmware-file, an installation manual and the CSR BlueSuiteNow.
Of course I cannot provide any warranty that you will not brick your device, but acoording to many owners they were able to successfully update his Charge 2 from 1.3.8 to 1.4.1:
Here are some alternate download-links:
Please let us know if your update was successful!
WARNING: Some already managed to brick their speakers, so apply on your own risk!