From the ones I got, I found MAUI in the name of the firmware, and on Wikipedia I found these notes: > MAUI, a feature-phone operating system used with MediaTe

From the ones I got, I found MAUI in the name of the firmware, and on Wikipedia I found these notes: > MAUI, a feature-phone operating system used with MediaTek-based shanzhai devices, also used on Motorola phones and some Samsung feature phones. > MediaTek developed an embedded operating system named MAUI Runtime Environment which is based on Nucleus RTOS. So it's not raw Nucleus.