Hacking Questions About These SysCheck Results

[Maidvelia]

IOS 90 (rev 54321): Trucha Bug; ES_Identify; NAND Access
IOS202 (rev 65535): Trucha Bug; ES_Identify; NAND Access; USB 2.0
IOS222 (rev 4): Stub
IOS223 (rev 4): Stub
IOS224 (rev 65535): Trucha Bug; ES_Identify; NAND Access; USB 2.0
IOS236 (rev 54321): Trucha Bug; ES_Identify; NAND Access
IOS245 (rev 21008): Trucha Bug; ES_Identify; NAND Access
IOS246 (rev 21008): Trucha Bug; ES_Identify; NAND Access
IOS247 (rev 21008): Trucha Bug; ES_Identify; NAND Access
IOS248 (rev 21008): Trucha Bug; ES_Identify; NAND Access
IOS249 (rev 65535): Trucha Bug; ES_Identify; NAND Access
IOS250 (rev 65535): Trucha Bug; ES_Identify; NAND Access
IOS251 (rev 21008): Trucha Bug; ES_Identify; NAND Access

(every IOS before 90 is clean, so I did not mention those)

What is IOS 90 for? I thought all patched IOS'es were 200+, so I assume this is not a patched IOS.
I heard from someone that the only patched IOS'es that are necessary for USB loading are d2x 249 and 250. Can I get rid of everything else?
I just want the "cleanest" softmod with no extra stuff. What patched IOS'es would accomplish this?

 

[XFlak]

U can use Modmii's syscheck analyzer to get you running the latest and greatest. Don't worry about any IOSs installed that you're not using, but technically you could delete 90, 245-248. 90 was likely installed as some potentially preventative measure against a 4.4 update that never came, and the others likely some alternate cios's for testing purposes

The IOSs with version numbers 21008 are likely d2x v8