Hello, I have an "R4i Upgrade Revolution for DS" card which also says "r4i-sdhc". (plus a dot then the first three letters of computer, damn filtering)
When I boot it (with the latest firmware available on r4i-sdhc, V1.12d), it says "Wrong date or firmware expired!...". Searching around seems...
btw i feel this a good time to remind you guys that sea of thieves was made by rare, who also made DKC1-3 and DK64, alongside banjo kazooie and conker's bad fur day