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Just updates your DSi to the latest firmware.
There are currently no viruses that target the DSi's firmware. It cannot get a virus.
The R4i will work in all DSis with the 1.0-1.3 firmware. It will NOT work it your DSi has been updated to the 1.4 firmware.
No, Nintendo's updates block Flash carts ther not going to let you use an old firmware.
R4 has released a firmware update. So just put the newer one on your r4 card and it will work.