If your device is suffering from hypervisor-level corruption—random reboots, IMEI null, or a boot loop that no factory reset can fix—then performing a is the only solution. However, this is an advanced procedure. Mistakenly flashing the wrong vmm.bin will convert your tablet into a paperweight.
Alternatively, go to and choose Local Update . sp9853i 1h10 vmm firmware update full
* Операционная система Android 8.1. * Процессор В системе прописали как Octa-sp9853i на процессоре шелкография Spreadtrum SC9853I. How to update sp9853i_1h10_vmm to higher android version? sp9853i 1h10 vmm firmware update full
: Reduces crashes and slow performance often seen in older builds. Connectivity Enhancements sp9853i 1h10 vmm firmware update full