Update all software when performing software upgrade on Volvo S80

Several software related issues have been reported and it is recommended that when a software upgrade is performed, all the software should be updated
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Average mileage: 162,282 (157,564–167,000)
3 model years affected: 1999, 2000, 2001
6 people reported this problem
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problem details
2000 Volvo S80 157,564 mi,
How do i update software?
2000 Volvo S80 167,000 mi,
Says trasmission service needed...car shakes..gears hard to shift..light on gears wont work, stay on P.