Yes, the links in the first page will bring you to a page in iClarified for a list of iPhone Firmwares. The iPhone Firmwares will be downloaded directly from the official Apple Servers and not from any other sites

For downgrading, here's a guide from iClarified

http://www.iclarified.com/entry/index.php?enid=16496

I'll put it in the first post if I see a lot of people asking about downgrading.

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Added on February 4, 2012, 5:59 pm

I have had no issues with my iPhone 4 which I upgraded from 4.3.3 jailbreak to the latest 5.0.1 jailbreak.

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Added on February 4, 2012, 6:11 pmI have added the Guide to Downgrading and some info about it in the first post.

Are you stuck in the recovery mode now?

Not necessarily. If he used preserve baseband only method, it will not jailbreak (it will upgrade and preserve baseband only). I think the guide (for sn0wbreeze) in post #1 should be helpful. You should use Expert mode which will preserve baseband and also jailbreak at the same time.

He never mentioned how he installed Corona because in the same sentence he mentioned that he had to use redsn0w to boot so basically he's confusing everyone also heh heh heh.

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Added on February 6, 2012, 12:55 pm
You need to tell us what you did step by step.

This is what I gathered

1. You upgraded your iPhone 4 using sn0wbreeze and preserve your baseband - how did you do this? Via Expert Mode or Basic Mode or Preserve Baseband mode only?
2. How did you install Corona? Was your iPhone jailbroken after your upgrade via sn0wbreeze custom firmware? Or did you upgrade via sn0wbreeze and then jailbreak via redsn0w?

I am asking this because there are many ways and methods to jailbreak especially if custom firmware is involved.

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Added on February 6, 2012, 12:57 pmLook at the information about sn0wbreeze options below ... which one did you use?

In sn0wbreeze 2.9, the following modes are present:
1. iFaith Mode: This mode lets you create custom firmware using SHSH blobs saved by iFaith or TinyUmbrella
2. Simple Mode: This mode jailbreaks and installs Cydia and other recommended stuff automatically. This mode is for users who just want to jailbreak their iDevice
3. Expert Mode: Besides installing Cydia, this mode gives more advanced options like custom boot logos, root partition size, etc. Expert mode also gives the option to “hacktivate”
4. Baseband Preservation Mode: This mode just preserves the baseband. It doesn’t install or jailbreak the iOS

If that is the case then you should not have installed corona because sn0wbreeze 2.9.1 should have installed the corona exploit for you.

My suggestion is for you to rerun sn0wbreeze again.

If it is a locked set, you may not have a choice as you may need to Hacktivate.

If it is a locked set, you may not have a choice as you may need to Hacktivate.

restore using 9A406 5.0.1

No, 9A406 is only for the 4s. Are you using a locked set with a preserve baseband?

What baseband are you on? 01.59.00 on the iPhone 4?
What method did you use again (probably somewhere in the previous pages but probably easier if you inform it here)?

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Added on February 10, 2012, 2:20 pmThere are threads in MacRumours regarding this signal lost problem for those on 01.59.00 baseband on iOS 5.0.1, I assume you are using sn0wbreeze to preserve the baseband. If you have the opportunity to use a Mac, you can doing the restore using custom firmware created via PwnageTool.

i have a question, for locked iphone 4 sold on Garage Sales, can we unlock it using ultrasnow?

why not worth buying locked set?
because we can't instantly upgrade to latest IOS?

locked set iphone 4 usually sold for only 1k at the garage sales

What gevey are you using? Pro?

Should be ok if you are using the original gevey. Its stable. I was using for about 5 months with no issue.

Have you tried with other telco sim card? Just to confirm its umobile issue.