Для разлока нужен root, бокс делает только до 2.3.5.

Выкладываю универсальный root для следующих моделей:
GT-S5570, GT-S5570B, GT-S5570I, GT-S5570L, GT-S5660, GT-S5660M, GT-S5660L, GT-S5670, GT-S5670B, GT-S5670L, GT-S5830, GT-S5830B, GT-S5830C ,GT-S5830D, GT-S5830i, GT-S5830L, GT-S5830T, GT-B7510, GT-S5360, GT-S5360L, GT-S5360T, GT-S5363, GT-S5690.

Кидаем Universal_GB_ROOT_v9.zip на флешку, заходим в recovery (vol+ - Home - Power)
через меню apply update from sdcard устанавлеваем root, ну а дальше уже через Z3x делаем unlock.

Новая версия v20.
Поддерживаемые модели> SAMSUNG GALAXY GT-S5570, GT-S5570B, GT-S5570I, GT-S5570L, GT-S5571 (new), GT-S5660, GT-S5660M, GT-S5660L, GT-S5660V, SHW-M290K (Korean GIO), GT-S5670, GT-S5670B, GT-S5670L, GT-S5830, GT-S5830B, GT-S5830C ,GT-S5830D, GT-S5830i, GT-S5830L, GT-S5830M, GT-S5830T (new) , GT-S5830Z (new), GT-S5839i (new) GT-B7510, GT-B7510B, GT-B7510L, GT-B7800, GT-B5510, GT-B5510B, GT-B5510L, GT-B5512, GT-B5512B. GT-S6102, GT-S6102B (new) , GT-S5300, GT-S5360, GT-S5360B (new), GT-S5360L, GT-S5360T, GT-S5363, GT-S5369, GT-S5690, GT-S5690M (new) GT-S5690L, GT-I8150, GT-I8150B, GT-I5510, GT-I5510B, GT-I5510L, GT-I5510M, GT-I5510T.

Новая версия> v. 25
UNIVERSAL GINGERBREAD ROOT SAMSUNG GALAXY MODELS: GT-S5570, GT-S5570B, GT-S5570I, GT-S5570L, GT-S5571, GT-S5578 (Chinese Mini), GT-S5660, GT-S5660M, GT-S5660L, GT-S5660V, SHW-M290K (Korean Gio), GT-S5670, GT-S5670B, GT-S5670L, GT-S5830, GT-S5830B, GT-S5830C, GT-S5830D, GT-S5830F(La Fleur), GT-S5830i, GT-S5830L, GT-S5830M, GT-S5830T, GT-S5830V, GT-S5830Z, GT-S5839i, GT-S6802, GT-B5330, GT-B7510, GT-B7510B, GT-B7510L, GT-B7800, GT-B5510, GT-B5510B, GT-B5510L, GT-B5512, GT-B5512B, GT-S6102, GT-S6102B, GT-S5300, GT-S5300B, GT-S5302, GT-S5360, GT-S5360B, GT-S5360L, GT-S5360T, GT-S5363, GT-S5369, GT-S5690, GT-S5690i(new), GT-S5690L, GT-S5690M, GT-S5690R(new), GT-I8150, GT-I8150B, GT-I5510, GT-I5510B, GT-I5510L, GT-I5510M, GT-I5510T, SCH-i509, SGH-T499, SGH-T499Y(new), SGH-T499V(new), SGH-T499W(new), SGH-T589, SGH-T589R, SGH-T589W(new), SGH-I827, SGH-I837, SGH-I857.