1. It isn't stuck in "Loading..." since the DSi couldn't detect the actual cartridge in the game slot.Replace everything, ideally.
Few things to note with the behaviour:
I'd personally like to hear exactly what you did with TWiLight Menu++. It seems you tried it, but there's no way you got this to boot because TWiLight does not have an autoboot for this cart and you didn't have a kernel. Meaning you 100% used the wrong one.
- If it is stuck at "Loading..." then for some reason it is not accepting this kernel. I have a different one for that occasion.
- If it's a white screen, and the HOME/DSi/DS Menu does not show any icon, then it is likely you bricked your cart. Usually it's from trying to run YSMenu on a flashcart you shouldn't be running it on, but using the wrong TWiLight Menu++ autoboot can also lead to this. You kind of have to be extra careful with that. (No autoboot for the r4isdhc.hk carts exist at this time.)
- You need an SPI flasher to fix this, and you somehow need to grab a backup from another cart which isn't publicly available as these carts never supported ntrboot properly and thus there was a lack of interest. As far as understanding why it bricks, it's because when using the DSTT DLDI, which is what YSMenu and some TWiLight Menu++ autoboots are based on, because they are differently designed it triggers the wrong register and it wipes the flash completely. A lot of the quotes on "don't use kernels where it isn't meant to be!" is exactly for this reason.
2. I have tried running YSMenu yesterday on my flashcart and it did boot to the R4 Menu, but when i tried YSMenu, it only displayed a white screen on the bottom half of the DS for quite some time. I suspect it lead to the wrong TwilightMenu autoboot.
What is an SPI Flasher? Also what is ntrboot?
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The process of me installing TwilightMenu++ went like this:
Being frustrated by not being able to play GBA games on the DSi ---> see that TwilightMenu has built in emulators and can run GBA games with ease ---> try installing TwilightMenu on flashcart after a format ---> Where we are now, with the Flashcart not working and not being detected by the DSi