Just an update - iBasso reckons it’s a faulty Bluetooth module. Not really worthwhile repairing imho. Probably will sell it “as is”. I am guessing that the entire logic board will need replacement (presuming that the previously mentioned VERY slow web browsing is not typical for the product).
Back to my AK120II it seems.
Very disappointing for what was a lightly used and well kept product.
edit: Have gotten home from a long day at work. Visited the ibasso.com website - took 2 minutes to load the main page. 2 minutes to load the download page to finish loading (well, not 100% but good enough for me to see the DX220 page and to be able to click on it). 10 minutes for the DX220 firmware page to load. 5 minutes for the download icons on that page to load...they must have a 286 serving their webpage

Does anyone have a copy of the 1.18.284 and 1.19.324 firmware RAR files that they can throw up on google drive etc and share with me?