Further to my thread on installation queries, I decided to fit a 64GB memory card. As it was a new card, I did a quick format on my computer then tried it. Message came up "memory error" so I did a full format with the same result. I then tried an old 32GB card & it worked fine, so the camera was ok. Tried another format, same result, so I then tried loading some files on the card & it worked, so card was ok. Tried umpteen things with same result, then by chance I came across this video on YouTube where the guy said that the file system on all new cards above 32GB come as ex fat partition & cards up to 32GB come as Fat 32 which is what the A119 reads, so the bigger card would not work. However Viofo obviously realised this & designed their camera to reformat the card to Fat32, but you had to format the card in the camera, not a computer. I tried this & it worked first time. Video below
Also I changed my firmware to version 3 as the camera came with version 2.. Easiest way is to download version 3 on to an SD card then put it into the camera & update it that way. Another useful video after I spent ages trying different ways
Hope this of help & saves a lot of time unlike my efforts