[paieye]

For the benefit of any others that have struggled as I have with this. -- and judging from what I have seen online, there are many,, many such others -- here is the eventual solution:


1. I went to Manage My Content and Devices in Amazon, and ticked my Amazon Fire as my default Device.

2. I uninstalled Calibre from my new MacBook, and reinstalled it.

3. On my old MacBook, I exported the contents of the Calibre Library to an empty folder on an external drive.

4. On my new MacBook, I imported the contents to Calibre.

5. Wearied by interminable discussion about special file-transfer software, the need for a particular type of cable, using wifi or email, I connected the Fire to my MacBook with a cheap generic. cable of the kind scorned by Amazon as unfit for the purpose. I now noticed that, even though Finder on my MacBook had not detected the Fire, Calibre had done so, in tiny print at the foot of the window.

6. I clicked Send to Device in Calibre selected all 124 books, and sent them to the Fire. A good many of them were in a format not recognised by the. software, but I clicked Convert as required. The task took about half-an-hour, but to my great joy the books are now for the 1st time in nearly a year in the Fire, and I have read parts of them to verify that all is well there.

Again, thank you all that have tried to help me.