- I updated Huawei P9 EVA-L19 to C185B405 from system updates but it started to shutdown automatically. I tried to downgrade to C185B180. I installed Rollback-C185B180 and then forced installed C185B180 from (volume up + down & power buttons) but the firmware looked too old. So I tried to upgrade it to C185B405 again manually but I mistakenly installed the Rollback-C185B180 file again. Now every time I switch on it stuck on the logo. I tried to hard reset but the buttons are not working now. I tried to install new firmware but it doesn’t go into recovery, safe or fastboot mode. Due to its stuck issue, phone gets heat up and swelled the battery. I changed the battery but didn’t try to do anything. Please suggest me what should I do to fix it. Thanks in advance.