problem with flashing rom - Galaxy S III Q&A, Help & Troubleshooting

Hi all my name is Gaurav and i'm from India.First of all i want to thank all you guys at xda of the support and help you are providing to people(noobs)like me and making our experience of using the smartphones much more smarter and enjoyable.
I own a SAMSUNG GALAXY S3 GT I9300 with following details
1) ANDROID VERSION-4.1.2
2) BASEBAND VERSION-I9300DDEMG2
3) KERNEL VERSION-3.0.31-1292854 [email protected]*1
4) BUILD NUMBER-JZ054K.I9300XXEMG5
I've recently roote my phone via odin and have the latest CWM recovery installed
My questions are:-
1) while downloading roms should i go for roms which are based on my android version ie 4.1.2 or can i flash any roms based on any android version?
2) Which GAPPS are available for SGS3GT I9300? should i go for GAPPS for my android version 4.1.2 or any GAPPS?
3) I today tried to flash AVATAR rom "avatar-nightly_3.1-636-20130823-NIGHTLY-i9300" and gapps-jb-20121011-signed and followed the entire procedure of wiping dalvik cache and all but on rebooting got a message that AVATAR ROM HAS DETECTED A CRASH and SET WIZARD HAS FAILED.Please tell me what did i do wrong?
Thanks to so many tutorials by xda members i had already backed up my previous rom so i'm safe but i want to flash a new rom,kindly help
Anticipating a quick response..........zillion thanks in advance

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Hi,
Try again wipe data... reset. Otherwise re-download ur avatar rom flash with cwm
Sent from my Lenovo P770 using xda app-developers app

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We already answered in the other 2 threads. Just read general > sticky roll-up thread. Look for "understanding the basics before rooting"
Do you even know what gapps are? Please READ the thread and please stop reposting the same thread over and over
Sent from my GT-I9300 using Tapatalk 4

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while downloading roms should i go for roms which are based on my android version ie 4.1.2 or can i flash any roms based on any android version?
Mostly any but read the faqs first
I today tried to flash AVATAR rom "avatar-nightly_3.1-636-20130823-NIGHTLY-i9300" and gapps-jb-20121011-signed and followed the entire procedure of wiping dalvik cache and all but on rebooting got a message that AVATAR ROM HAS DETECTED A CRASH and SET WIZARD HAS FAILED.Please tell me what did i do wrong?
Ask in the roms thread but usual is user not following the instructions .
Which GAPPS are available for SGS3GT I9300? should i go for GAPPS for my android version
GApps are for specific roms not something you flash unless instructed to .
Again you are sadly lacking in basic understanding . To avoid bricking your phone read and understand the faqs and guides first .
jje

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rootSU said:
We already answered in the other 2 threads. Just read general > sticky roll-up thread. Look for "understanding the basics before rooting"
Do you even know what gapps are? Please READ the thread and please stop reposting the same thread over and over
Sent from my GT-I9300 using Tapatalk 4
Click to expand...
Click to collapse
Dear rootSU the answers were not given earlier.i admit that i've not gone through the basics but i definitely did what was described in the tutorials and that's why i had made a backup of my stock rom and so am ever thankful to you guys and i know you guys are very busy.
thanks for guiding me to this thread.

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JJEgan said:
while downloading roms should i go for roms which are based on my android version ie 4.1.2 or can i flash any roms based on any android version?
Mostly any but read the faqs first
I today tried to flash AVATAR rom "avatar-nightly_3.1-636-20130823-NIGHTLY-i9300" and gapps-jb-20121011-signed and followed the entire procedure of wiping dalvik cache and all but on rebooting got a message that AVATAR ROM HAS DETECTED A CRASH and SET WIZARD HAS FAILED.Please tell me what did i do wrong?
Ask in the roms thread but usual is user not following the instructions .
Which GAPPS are available for SGS3GT I9300? should i go for GAPPS for my android version
GApps are for specific roms not something you flash unless instructed to .
Again you are sadly lacking in basic understanding . To avoid bricking your phone read and understand the faqs and guides first .
jje
Click to expand...
Click to collapse
thanks JJe, so finally i got a response from you the third time ,although i admit that first two times i was wrong and this i would keep in mind
1) about the avatar rom i did posted in the avatar forum and was told to flash siyah kernel via odin as am coming from stock samaung rom.Not being sure about that i ask you now.
and thanks again as you have definitely helped.

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patilsb said:
Hi,
Try again wipe data... reset. Otherwise re-download ur avatar rom flash with cwm
Sent from my Lenovo P770 using xda app-developers app
Click to expand...
Click to collapse
thanks patilsb thanks a lot.i'll try again.