Target LPC4088 not recognized

I just tried to compile a program for the LPC4088, for mbed OS 5 and am getting the following error message:

Target “LPC4088” not recognized.

Is this expected?

up to 5.15.x it should work, after that it was removed (as many other ‘unpopular’ targets).

it looks like my mbed OS version was changed “secretly” to OS 6.0. Changing back to 5.15 worked fine.