Inspiron 15R N5010 / Win7HB /

I wanna know if anybody updated bios of this system successfully, 'coz I'm having some hardware issues

The Fan continuously running.....No brightness control for Non-OS platforms...does not recognize Battery sometimes....etc

So, I wanna do an update... but as earlier told by many experts that updating BIOS can cause a system failure, i'm a bit scared about it. Can anybody report here of successful BIOS update done on Inspiron N5010.... Experts, please suggest some measures for BIOS update particularly for N5010.