If you don't have a way to reload the stock OS either from the manufacturer or with a tool like MTK Droid (I'm assuming it has a MediaTek chip as most of those kinds of phones have them), then it will be risky. Sometimes it just doesn't do anything. Sometimes it messes up the recovery partition, but you can still boot. And sometimes it'll bootloop you. Not much way to tell without testing.
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HTC Droid Eris / Motorola Droid / Samsung Galaxy S Fascinate / Motorola Droid X / LG G2x / HTC Evo 3D (x2) / Samsung Epic 4G Touch (Sprint S2) / HTC Amaze / Samsung Galaxy S3 (International) / Samsung Galaxy Note 2 / Nexus 4 / HTC One / Samsung Galaxy S4 / Sony Xperia ZL / Nexus 5 / ? (One+1 maybe...)