Sat May 18, 2019 10:51 am
Hi.
First question would be were are you getting the SD cards from , could they be fake ?
Then what I would do is down load a new copy of the raspbian image from the web site, then I would try using a different SD card reader , especially if you are using a built in one as it may not be fully compatible with SD/HC cards.
We want information… information… information........................no information no help
The use of crystal balls & mind reading are not supported