I have a Renesas FRB-R9A02G021 (https://www.renesas.com/en/products/mi…ototyping-board). It came with J-Link OB.
On connecting to my computer, J-Flash said it needed to upgrade the J-Link OB. It took a couple of attempts, but I managed to get this done.
I compiled a test application that blinked an LED, and then flashed it using J-Flash Lite. This was successful.
I recompiled my test application, and I cannot flash it - I get errors from J-Link.
I tried the UART Bootloader, and that cannot flash the device either - you get an error that Renesas tells me implies the device has been locked against further programming.
When you run J-Flash Lite, it offers three memory regions. The middle one is unticked by default, and I might have ticked it (I don't recall). But, if I *had* ticked it, and that memory region was not in my .hex file, would J-Flash Lite have erased this area and left it at all-1s, or would it have written all-0s? I ask, because it's the Flash Configuration region and writing 0 to the first word will disable all programming, as appears to have occurred.