Since you're already on Astro, and you also want to have HD, then the cheapest option you can go for is this (all prices excludes SST):
Starter Pack with New Emperor = RM61.32/month
Then, add 1 mini pack (which is Kids pack) costs RM12

Note:
- Starter pack is actually Family Pack but it bundled with HD service, so no need to subscribe and pay HD service separately, and also includes vernacular pack (for your case, go for Chinese one, which is New Emperor pack).
All these bundled into one monthly price, which is RM61.32 (RM65 incl SST).
- Kids Pack includes Nickelodeon (612/632), Disney Junior (613/633), Disney Channel (615/635) and Cartoon Network (616/636).
Meanwhile, these 3 channels: Astro Ceria (611/631), Astro Xiao Tai Yang (325/304) and Disney XD (637) are included in Family pack, so you can still watch these 3 kids channels even if you don't feel like adding RM12 for the Kids pack.
- Just in case you don't know, New Emperor pack includes Astro Hua Hee Dai, and also these channels:


Total: RM61.32 + RM12 = RM77.70 incl SST

Once you're on this Starter pack, you'll have 6 months contract. If you cancel Starter pack before contract period ends, penalty of RM100 will be charged.

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Q: Sill want to go for Njoi, but want to watch Astro Hua Hee Dai and some Kids channels?
A: You can consider go for Njoi's prepaid channels:

     
For Kids channel, if you don't prefer all 6 of these kids channels, you can opt for RM20 per kids channel per month of your choice, similar like Astro Hua Hee Dai as above.

If you count here and there, subscribe to that Starter pack is more worth it la... But the choice is up to you.
I'm not from Astro. So if you want to subscribe, contact Astro directly.

The price you see online, it's actually an online exclusive promo. You can sign it up here:
https://promotions.astro.com.my/details/online-starter-pack

The online promo is, you can get additional RM7 rebate for 24 months. After 24 months, no more rebate, it will go from RM58 to RM65 per month incl SST.
So if add either Kids pack or New Emperor, it costs extra RM12.72 incl SST (RM12 before SST).

In conclusion, if you sign up online:

Got all sort of confusing rebates la, discount la, then that's the price you'd pay lo.. 

*The One Time Installation Fee is applicable for new Astro installations only.

The catch is, if you get this online promo, the package contract period will be 24 months instead of 6 months contract like what I mentioned earlier, the non-discounted RM65 Starter Pack.
If you don't mind about the contract period, then it should be fine for you to go for the online promo.

no, the njoi decorder is HD ZAPPER , so it won't hang due to only can watch linear channel, no VOD function

If I remember correctly, if you're already using Ulti or Ultra Box, you are not allowed to convert to NJOI.
You can double confirm again with customer service.

Does your Ulti/Ultra often hang?
If yes, try disable Wi-Fi or unplug the LAN cable (if have) on your Ulti/Ultra Box, and see if whatever hang issue persists.

maybe can try setting "info banner" set to 1s?

ops...cant set the start up menu.