I have also heard that some card readers can think a microSD card is write-protected if it isn't properly positioned (something to do with write-protect tabs at the side) but I've tried my faulty cards in 3 readers, pushed in snugly, without success, although other cards write without problems. If it is this hardware problem than no software solution can override the card's internal controller tools like fdisk, mkfs and so on might appear to do their job, but when you remove the card and put it in again the state was exactly as it was before! (By the way: it is best NOT to reformat SD cards - see the Wikipedia: ) ![]() If it still is read-only the reason probably is that the card itself has put itself in read-only mode due to some internal error (Google: "go read-only if it has not enough working flash cells to write"). On Raspberry pi, I can read the serial number of SD card mounted on the built-in SD card drive from cid file under /sys/block/mmcblk0/device folder. Remove and reinsert SD card to check new CID. software permissions/ownership and write-protect switch on the adapter - remember the switch is low quality, try moving back and forth a bit) and trying the hdparm -r option (software can set the hardware into read-only mode see the hdparm man page Windows has a corresponding software method too). You need a Linux (Ubuntu) PC with integrated SD card reader. Execution of all commands to change and validate the change of c and d. 3.Push the image back to your phone by the flash it back to the sdf1 partition by 4.Done. For me, it is change it to the cid you want. Of course, it must be a card that allows you to change the number. Changing cid: 1.Get image of sdf1 partition by and then pull it to your computer by 2.Open the image file by text editor, find the cid of your phone. ![]() I have tried several solutions, and none of them worked. Being careful to turn the camera off, I removed the card and tried to mount it in Ubuntu. I then un-mounted the card, returned it to the camera, and formatted it in the camera. ![]() It mounted fine and all the pictures were accessible. After that change and a rebuild of the BSP from scratch my board boots. I have found this problem annoyingly often with microSD cards. 1 method: It is uploading to the microsd card that we want to change, the operating system, using the raspberry pi Imager. I am trying to access my SD card as a general user after it somehow changed to just Root access. I ejected the card, placed it in the camera, took several pictures, and returned it to the Ubuntu 14.04 card reader. Turns out that on ES2 silicon with the REV 1 board the boot mode needs to be set to E.
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