Arkas is ROM for Galaxy 551 .It was created in frustration that 551 will never be upgraded to gingerbread.

It is revolutionary ROM with many features not available in the stock ROM .
This page is dedicated only for the  stable releases .

I would appreciate if you read the full post since it may give you a rough Idea.

0.4,0.401,0.433 are to be flashed as PDA in odin

0.533,0.564 are to be flashed as one package .

A)Arkas 0.4 : It started with this ROM .The first milestone .Historic Wonder .

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B.)Arkas 0.433 : Just a Rooted ROM . A minor update (or a major one ) .Ageing Now .

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C.)Arkas 0.401 : The successor to 0.4 is a bit more optimized than 0.4

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D.)Arkas 0.533 : The spiritual second milestone .Apart from more aggressive clocks ,it had segmented overclocking .

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E.)Arkas 0.564 : The third milestone .Currently the only stable ROM with Adobe Flash 10.1 support and hundreds of ARM patches .It’s a boy Wonder ROM .

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F.)Arkas 0.6 :The last Froyo ROM .Packs a punch surpassing all ROMs in terms of performance .It’s very fast and all the bugs have ben removed.Stable .Safe .Fast.A must install Froyo ROM

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G.)Arkas 0.620 :  Bug Free and quite decent .Balancing everything the right way .

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Gingerbread

Arkas 1.2 :Ganymede 3 Deodexed and rooted

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Arkas 1.5 : Einherjar  Super Patched Perseus 2

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Arkas 1.6 : Tzeentch :  This is upgrade to Arkas 1.5 . KP1 Radios is required /preferred

Post for it’s info 1690 version only

Arkas 1.2.3 : Ganymede 5 : This is for all those with the display bug . KP1 Radios is required /preferred

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